Best ultrasonic cleaner 10l to buy in 2019
Shopping ultrasonic cleaner 10l has never been easy. You may come many of website, read ultrasonic cleaner 10l reviews, check the price… It will really makes you headache and tired. Don’t worry! I’ve found ways to make it less painful. Let’s find in below article.
Shopping ultrasonic cleaner 10l has never been easy. You may come many of website, read ultrasonic cleaner 10l reviews, check the price… It will really makes you headache and tired. Don’t worry! I’ve found ways to make it less painful. Let’s find in below article.
Best ultrasonic cleaner 10l
1. Ultrasonic Cleaner 10L Sonic Ultrasonic Jewelry Denture Parts Cleaner with Digital Timer Heater Control
Feature
Digital control, LED digital display, easy to see the remaining time clearlyTime setting: 1 - 30 minutes; Temperature setting: 0-60 degrees Celsius3x strengthened transducers make the ultrasonic more powerful (42 KHz and 240 Watts ultrasonic cleaning power) and provides remarkable cleaning results.
10L ultrasonic cleaner durable stainless steel SUS 304 construction.Auto stand-by and sleep mode. Stainless steel cleaning basket for cleaning some small objects which need less friction, it can reduce the friction between the small objects and the tank.
Large ultrasonic cleaner is perfect for commercial component,hospital medical equipment/devices cleaning
CE,FCC and RoHS Approved
Description
ApplicationAVAILABLE FOR ultrasonic parts cleaner daily used (Electric shaver heads, Razor blades,Dentures, Combs, Toothbrushes etc.
AVAILABLE FOR cleaning Medical Instruments (Dentures, scalpels, medical equipment)
AVAILABLE FOR cleaning Medical Instruments (Dentures, scalpels, medical equipment)
AVAILABLE FOR cleaning all kinds of the gun.
Technical Deatails
Ultrasonic Power : 360W
Heating Power 300W
Frequency: 40kHz
Voltage: AC110V60Hz
Tank Capacity: 10L
Time Setting: 1 - 30 minutes. DO NOT continuously heating it for over 30mins
Temperature Setting: 0-80 degrees Celsius
Tank Size:30*24*15cm (L x W x H)
Unit Size: 32.5*26.5*28.5 (L x W x H) Tank Material:Stainless Steel SUS304
Package:
1 x Ultrasonic Cleaner
1 x Cleaning Basket
1 x Cleaning Cover
1x Instruction Manuel
2. Mophorn 10L Professional Ultrasonic Cleaner 490W 304&316 Stainless Steel Digital Lab Ultrasonic Cleaner with Heater Timer for Jewelry Watch Glasses Circuit Board Dentures Small Parts Dental Instrument
Feature
[PREMIUM MATERIAL] -Input: 110V; Machine Power: 490W; Ultrasonic Frequency: 40Khz; Made Of High Quality 316 & 304 Typed Stainless Steel. Anti-Rust To Different Kinds Of Solutions, Corrosion-Resistant And No Water Seepage After Long Time Use. Great Product To Clean Your Things, Get Rid Of Heavy Manual Works.[HEATING & WORKING] - Equip With Micro-Computer Controlled Heater And Timer, It Supports 0-176 Liquid Heating And 0-60 Minutes Working Time Select. Auto Start Cleaning After Setting, Ultrasonic Cleaning And Heating Can Work At The Same Time. Get Brand New Valuables After It Finished. Save Time, Money & Labor For You.
[POWERFUL & LARGE CAPACITY] - Built-In Powerful Transducers, Strengthen The Ultrasonic Power And Make Superior Cleaning Outcome. 10l Big Tank To Hold More Goods a Time And It Is Low Noise On Use. Never Disturb Your Other Works.
[USER-FRIENDLY DESIGN] - This Tabletop Ultrasonic Washer Is Designed For Better Customer Use: Portable Handle, Heat Dissipation, Anti-Slide Rubber Feet, Lid And Led Screen To Display Setting & Actual Time + Temperature.
[PRACTICAL APPLICATIONS] - Works Great To Remove Oil, Wax, Stain Quickly. Perfect For Cleaning The Longhole, Crevice And Shelter Of Piece Part Or Workpiece, No Need To Touch Cleaning Fluid By Your Hands. Commercial, Home & Industrial Use Are Acceptable.
Description
This Is a High Efficiency Ultrasonic Cleaner Used For Daily Or Professional Cleaning Works. It Will Emit 40Khz Ultrasonic Wave To Deeply Wash Dirt On Your Valuable's Surface, Longhole, Crevice And Shelter. With Heating & Timing Function, Use Only Tape Water, If Needed, Some Solutions, Your Things Can Be Cleaned Thoroughly In Minutes. No Scratching Created, Great For Business, Commercial Or Home.
Specifications
Input: 110V; 60Hz
Ultrasonic Frequency: 40KHZ
Tank: 10L Capacity
Working Time: 0-60 Minutes
Cleaning Power: 240W
Heating Function: 250W(Power); 0-176Heating Temperature
Machine Power: 490W
Screen: LED Display
Product Size: 12.8x10.2x11.2"
Package Content
1 x Ultrasonic Cleaner
1 x Cleaning Basket
1 x Stainless Steel Cover
1 x User Manual
3. BestEquip Ultrasonic Cleaner Stainless Steel 10 L Commercial Ultrasonic Cleaner 240W Ultrasonic Power Ultrasonic Cleaner Heater Digital Timer and Temperature Display
Feature
Ultrasonic Cleaner power Supply: AC110V 60Hz.Heating Power: 250W.Ultrasonic Power: 240W.Frequency: 40kHzTank Capacity: 10 L .Time Setting: 1 - 30 minutes. Temperature Setting: 0-80 degrees Celsius
This commercial ultrasonic cleaner is perfect for cleaning the longhole, finedraw and shelter of piece part or workpiece, no need to touch cleaning fluid by your hands
Built-in Powerful Transducer can strengthen the ultrasonic power and make superior cleaning outcome
Application:Medical and Dental Clinics, Tattoo Shops, Scientific Labs and Golf Clubs.Jewelers, Opticians, Watchmakers, Antique Dealers and Electronics Workshops etc
Description
10 L Stainless Steel Ultrasonic Cleaner 240W Ultrasonic Power with Bracket and Drainage System
Ultrasonic cleaning is based on the cavitation effect caused by high frequency ultrasonic wave vibration signals in fluid. Microscopic bubbles that expand and rapidly collapse cause cavitation, which creates an effective cleaning action on the surface of object being cleaned. Additionally, the bubbles are small enough to penetrate even microscopic crevices, cleaning them thoroughly and consistently.
Item Specifications
Power Supply: AC110V 60Hz
Frequency: 40kHz
Heating Power: 250W
Ultrasonic Power: 240W
Tank Capacity: 10 L
Time Setting: 1 - 30 minutes (LED Digital Display)
Temperature Setting: 0-80 degrees Celsius
Transducer Quantity: 4 set
Tank Size: 11.81 "9.45 "5.90 " (L x W x H)
Ultrasonic Cleaner Size: 12.99 "10.63 "10.63" (L x W x H)
Package Content
1 x Ultrasonic Cleaner
1 x Cleaning Basket
1 x Instruction Manual
4. ROVSUN Ultrasonic Cleaner, Knob Control Timer Heater Adjustable Stainless Steel Ultrasonic Cleaning Machine, for Jewelry Watches Dentures Glasses Metal Parts, 3L/6L/10L 40KHz 110V US Plug (10L)
Feature
MULTIPLE INTERNATIONAL CERTIFICATIONFCC, CE and ROHS Approved, secure quality and reliable, perfect for home, lab and commercial use.EASY OPERATIONKnob design panel with timer and heater, for precise wash time and temperature control, more user-friendly and spand long-life. (Tips: the timer can be set from 0 to 20 minutes or normally open; the wash temperature can be set at 68-176 Fahrenheit.Please turn off the heater when cleanning finished)
SUPERIOR CLEANING OUTCOMEROVSUN sonic cleaner worked with 4 x 60W high-power ultrasonic transducers which provide more stable performance, higher conversion rate, higher cavitation effect, better cleaning effect. (Tips:Use only tap water for general cleaning, you also can add about 5-10ml of detergent into water to enhance wash result when needed.)
NOISE REDUCTION1.Super high quality industrial transducer with strengthen shocks which decrease the noise; 2.Rubber coated basket handles, decrease the shaking noise as well.
BULLET POINTS SUPERIOR THAN OTHER SELLERSROVSUN ultrasonic cleaner fetures: 1, Anti-fingerprint housing--304 superior embossed shell, without fingerprint left; 2,Corrosion-resistant inner tank--1mm thick, one-time stamping, easy to clean; 3,3,External drain--make it easy to drain after cleaning; 4,Anti-fall Packaging--packed with special packaging sponge and 5-layers carton, no sloshing, which protects cleaner completely;
Description
USA NJ/CA Stock, fast delivery. Shipping by FEDEX,UPS or USPSThis Ultrasonic Cleaner has powerful transducer, heater and large tank capacity, is suitable for cleaning off dirt, dust and smears from surfaces of items such as jewelry, household commodities, glasses, coins, metal parts and more.
Suggested applications:
- Scientific lab: eyeglass frames, lab, glassware, optical & contact lenses, pipettes, test tubes
- Electronics manufacturing: capacitors, ceramic substrates, PC boards, packaging components, SMDs
- Medical: dental labs, burs, blood oxygenators, cannulas, dental instruments, syringe parts
- Jewelry manufacturing: chains, charms, coins, intricate settings, precious metals, gemstones
- In auto industry: carburetor, castings, fuel injectors, machined parts, stamped parts, switches
Features:
1. 10L capacity tank for professional cleaning
2. 40 KHz strengthened transducer makes the ultrasonic more powerful
3. Timer setting with 0-20 minutes is adjustable
4. Heating function with 68-176 fahrenheit adjustable temperature
5. Quickly and thoroughly to remove all the dirt for complex parts
6. Bypass Louver for prolonged operation
7. Isolated-circuit design, good capability of waterproof
8. Durable and heat resistance stainless steel construction
9. Needs only plain tap water to clean (add a tiny amount of washing-up liquid for further effectiveness)
Specifications:
1. Timer Setting: 1-20 minutes Adjutable
2. Temperature Setting: 68-176F Adjutable
3. Ultrasonic Frequency: 40 KHz
4. Power Consumption: 240W
5. Voltage: 110V
6. Heating Power: 300W
7. Tank Material: Stainless Steel SUS304
8. Tank Capacity: 10L
9. Power Supply: AC 110V, 60Hz
12. Weight: 8 kg
13. Mains Fuse: 5A
5. Industry Jewelry Cleaner, Stainless Steel 10L Heated Washer for Jewelry Watch Tools Parts Instruments w/Timer 490W
Feature
LARGE & LENGTHENED TANK: Suitable for long industrial equipment. Tank capacity: 10L. The tank size 13"x10"x10". 304 stainless inner tank is anti-corrosion and heat resistance.WIDE APPLICATIONS: Professional use: for dirty electronics, medicine, experiment, machinery, hard alloy; Personal use: Jewelry, Earrings, Necklace, Rings, Bracelets and Diamonds.
DEEP & POWERFUL CLEANING: Generates 42,000 Hz of ultrasonic sound waves for a powerful yet gentle clean that won't harm your valuables. Would attack and remove even the most stubborn blemishes for a powerful yet gentle clean.
DIGITAL TIME & TEMPERATURE CONTROL: Digital display with 1-30 minutes cleaning cycles and auto shut off. Drains with Flow Control Valve for easy cleaning and rinsing. Quiet operation and solid state circuitry ensure a consistent clean every time.
SHIPPING: shipping within US. Usually takes about 4~7 days.
Description
Description:
The cleaner is a microprocessor- controlled device that uses ultrasonic or high frequency sound to clean electronics, medicine, experiment, machinery, hard alloy and chemical industry, etc. Ultrasonic cleaning is based on the cavitation effect caused by high frasonic wave vibration signals in fluid. Microscopic bubbles that expand and rapidly implode in the detergent. The the impact from it will peel off the stains of items which immersed in the detergent.
Specification:
Temperature Setting: 0-80 celsius
Transducer quantity: 4 set
Tank material: stainless steel SUS304
Heating power: 250W
Ultrasound power: 240W
Model: 10L
Frequency: AC110V-120V 60Hz
Capacity: 10L (2 1/2 gallon)
Time setting: 1-30 minutes
Package includes:
1 x cleaning main body
1 x power line
1 x cleaning basket
6. Tek Motion Stainless Steel Ultrasonic Jewelry Cleaner with Heater Timer, 15L
Feature
STRONG CLEANING POWER - 6 industrial grade ultrasonic transducers (6x60 W=360W), easily and thoroughly cleans your valuables and small items; designed with latest technologies, this ultrasonic cleaner is expert in cleaning, maintenance, oxidation, extraction, cavitation and more, which makes it accommodate users' different needs.EXTRA-THICK TANK: Extra-thick 0.06 in. (1.5mm)stainless steel tank with 3.97 Gal. (15L) volume, durable and sturdy to last for years to come, the integrated cleaning basket is perfect for keeping your jewelries, glasses, watches, or dentures in place
CONVENIENT SETTINGS: 68-140 cleaning temperature recommended for improved cleaning performance, the user-friendly pre-set cleaning time options (1-30 minutes) provide you with convenience
SAFE USE: Dual fuse protection to prevent burn-out, turning on/off the cleaner frequently is NOT recommended; in the event of fuse damage, please change one to get the machine back to work
1-YEAR WARRANTY: Backed by 1-year limited warranty, free exchange if the item is defective
Description
This ultrasonic cleaner tank is made of brushed stainless steel, making it durable and easy to maintain. It is made to be used with a wide range of products such as jewelry, glasses, diamonds, medical equipment etc...It is controlled by a microprocessor that uses ultrasonic waves, or high frequency sound waves, to clean jewelry and other delicate items. The ultrasonic wave creates microscopic bubbles that travel through the fluid, generating an impact wave known as "cavitation". Cavitation will affect the item it hits, and clean them by removing everything on its surface. This chemical and physical process is strong enough to clean items thoroughly, even within the tiny crevices of the item.
Domestic Use:
Jewelry: Earrings, Necklaces, Rings, Bracelets, Diamonds...
Glasses and Timepieces: Glasses, Sunglasses, Optical Lenses, Contact Lens Accessories, Watch Chains, Waterproof Watches...
Other tools: Tattoo Guns and Tubes, Electric Shaving Heads, Razor Blades, Combs...
Stationery: Printer-heads, Inkjet Cartridges and Seals...
Metal Articles: Antique Coins, Badges, Valves, Machine Nozzles, Electronics Components and Mechanical Parts...
Metal Dishware: Forks, Knives, Spoons and Other Small Silverware etc...
Package Includes:
1 x Digital Ultrasonic Cleaner
1 x Cleaning Basket
1 x Instruction Manual
Specifications:
Tank Material: Stainless Steel SUS304
Tank Capacity: 15L
Ultrasonic Cleaner Size: 14 13 10 3/5 inches
Tank Size: 13 11 4/5 6 inches
Power Supply: AC110V-120V 60Hz
Ultrasonic Power: 360W
Heating Power: 400W
Frequency: 40kHz
Temperature Setting: 20-80 degrees Celsius
Time Setting: 1 - 30 minutes (LED Digital Display) DO NOT continuously heating it for over 30mins
Transducer Quantity: 6 set
Weight: 22 lbs
7. Tek Motion 10L Digital Professional Ultrasonic Jewelry Cleaning Machine Cleaner with Heater, Timer (490 W, 4x60 W Transducers)
Feature
STRONG CLEANING POWER: 4 industrial grade ultrasonic transducers (4x60 W=240W), easily and thoroughly cleans your valuables and small items; designed with latest technologies, this ultrasonic cleaner is expert in cleaning, maintenance, oxidation, extraction, cavitation and more, which makes it accommodate users' different needs.EXTRA-THICK TANK: Extra-thick 0.04 in. (1.1mm) stainless steel tank with 2.6 Gal. (10L) volume, durable and sturdy to last for years to come; the integrated 10.2 x 7.9 x 3.1 in. cleaning basket is perfect for keeping your jewelries, glasses, watches, or dentures in place
CONVENIENT SETTINGS: 68-140 cleaning temperature recommended for improved cleaning performance, the user-friendly pre-set cleaning time options (1-30 minutes) provide you with convenience
SAFE USE: Dual fuse protection to prevent burn-out, turning on/off the cleaner frequently is NOT recommended; in the event of fuse damage, please change one to get the machine back to work
1-YEAR WARRANTY: Backed by 1-year limited warranty, free exchange if the item is defective
Description
Professional Use:Medical and dental clinics, tattooists, laboratories, jewelers, opticians, watchmakers, restaurants, antique dealers and golf courses.
Domestic Use:
Jewelry: Earrings, Necklaces, Rings, Bracelets and Diamonds.
Glasses and Timepieces: Glasses, Sunglasses, Optical Lenses, Contact Lens Accessories, Watch Chains and Waterproof Watches.
Tools of the Trade: Tattoo Guns and Tubes, Electric Shaving Heads, Razor Blades, Combs and Toothbrushes.
Stationery: Printer-heads, Ink Cartridges and Seals.
Metal Articles: Antique Coins, Badges, Valves, Machine Nozzles, Electronic Components and Mechanical Parts.
Metal Dishware: Forks, Knives, Spoon, Other Small Silverware etc.
Package Includes:
1 x Digital Ultrasonic Cleaner
1 x Cleaning Basket
1 x Manual
Specifications:
Total Working Power: 490 W
Cleaner Power: 240 W
Power Supply: AC110V-120V 60Hz
Heater: 250W (Digital Control)
Frequency: 40,000 Hz
Tank Materials: Stainless Steel SUS304
Tank Capacity: 10 liter (2 1/2gallon)
Cycles: 1 - 30 min (LED Digital Display) DO NOT continuously heating it for over 30mins
Temperature Setting: 0-80 degrees Celsius (32-176 degrees Fahrenheit)
Transducer Quantity: 4 set
Tank Size: 11"L x 9 1/2"W x 6"H
Product Size: 14"L x 10 1/2" W x 10 1/2"H
8. FoodKing Ultrasonic Cleaner Ultrasonic Cleaner Jewelry Ultrasonic Jewelry Eyeglass Commercial Industrial with Digital Heater Timer Basket (10 Liter)
Feature
This ultrasonic cleaner uses 304 stainless steel, with 10L capacity, CE, FCC and RoHS ApprovedThe ultrasonic cleaner has 250W heating power and 240W ultrasonic power
This machine generates 40kHz ultrasonic wave, clean thoroughly without any harm to your valuables
LED digital timer control time and temperature precisely, 1 to 30 minutes, 0 to 80 degrees Celsius
Easy to operate, uses tap water, great for jewelry, eyeglass, watches, dental, guns etc, with basket
Description
FoodKing Ultrasonic Cleaner with Digital Heater Timer Basket 10 Liter Capacity
Description
The ultrasonic cleaner is a microprocessor-controlled device that uses ultrasonic or high frequency sound waves to clean jewelry and other delicate items.Ultrasonic cleaning is based on the cavitation effect caused by high frequency ultrasonic wave vibration signals in fluid. Microscopic bubbles that expand and rapidly collapse cause cavitation, which creates an effective cleaning action on the surface of object being cleaned. Additionally, the bubbles are small enough to penetrate even microscopic crevices, cleaning them thoroughly and consistently.
Features
Built-in powerful transducers can strengthen the ultrasonic power and make superior cleaning outcome
Durable stainless steel construction
Ultrasonic cleaning and heating can work at the same time
High efficiency cleaning for teeny blot particles
Perfect for cleaning the longhole, finedraw and shelter of piece part or workpiece, no need to touch cleaning fluid by your hands
Stainless steel cleaning basket for cleaning some small objects which need less friction, it can reduce the friction between the small objects and the tank
Stainless steel tight fitting lid with handle to prevent water heat from diffusing
kidproof rubber feet
Use only tap water for general cleaning
Can add about 5-10 ML of detergent into water to enhance wash result when needed
Contents
1 x Ultrasonic Cleaner
1 x Cleaning Basket
1 x Instruction Manual
9. AW 10 L Liter Stainless Steel Ultrasonic Cleaner 490W Digital Timer Heater Jewelry Glasses Tattoo Dental
Feature
High quality durable stainless steel construction4 Sets of Built-in Powerful Transducers can strengthen the ultrasonic power and make superior cleaning outcome
Drains with Flow Control Valve for Easy Cleaning and Rinsing
3.28ft drain hose; CE, ROHS, FCC Certificated; Power line of UL certification
Use only tap water for general cleaning, you also can add about 5-10ml of detergent into water to enhance wash result when needed
Description
Features:- High quality durable stainless steel construction
- CE, ROHS, FCC Certificated
- Power line of UL certification
- Perfect for cleaning the longhole, finedraw and shelter of piece part or workpiece, no need to touch cleaning fluid by your hands
- High efficiency clean for teeny blot particles
- 4 Sets of Built-in Powerful Transducers can strengthen the ultrasonic power and make superior cleaning outcome
- Large digital timer and temperature display for precise wash time and temperature control
- Stainless steel cleaning basket for holding small objects
- Stainless steel lid to prevent water from diffusing
- Heat dissipation holes available
- Drains with Flow Control Valve for Easy Cleaning and Rinsing
- 3.28ft drain hose as FREE GIFT
- Skidproof rubber feet
- Use only tap water for general cleaning, you also can add about 5-10ml of detergent into water to enhance wash result when needed
- Please read the instruction manual before using
Specifications:
- Outer Dimension(LxWxH): 14 3/16" x 10 5/8" x 10 5/8"
- Inner Dimension(LxWxH): 11 13/16" x 9 7/16" x 5 7/8"
- Basket Dimension(LxWxH): 11" x 8 11/16" x 3 15/16"
- Electric Parameter: 110V, 490W
- Capacity: 10L
Package Contents:
- 1x Digital Ultrasonic Cleaner
- 1x Cleaning Basket
- 1x 3.28ft Drain Hose as FREE GIFT
- 1x Manual
Notices: If the machine needs to be operated for a long time(more than 2hrs per time), you need to stop the unit for 5 mins after 15 mins of continuous operation. Or it may damage the unit or severely shorten the service life of the unit.
10. TruSonik 10L Digital Ultrasonic Cleaner With Heater | Industrial Stainless Steel Body, Tub, & Basket | Cleans Jewellery, Dental & Tattoo Equipment, Guns & Gun Parts, Car Parts & Carbs, & More
Feature
DIGITAL: Computer controlled heating and cleaning cycle. Automatic cleaning frequency adjustment to maximize fluid penetration and cleaning effectiveness.HEATER: Built-in heater can heat the cleaning solution up to 130 degrees Fahrenheit (55 degrees Celsius) further amplifying the cleaning power of your solution.
INDUSTRIAL: Commercial construction with stainless steel body and inner tub. Also included is a small parts basket, also made of stainless steel.
UNIVERSAL: Designed to clean jewellery, dental equipment, tattoo equipment, guns and gun parts, car parts and carbs, and many more items.
WARRANTY: Full 1 year warranty serviced directly through us. We take care of you with complete after sale customer support.
Description
Do you know the optimal cleaning frequency of your solution?Different cleaning solutions have different resonance frequencies, meaning that they work best at their own unique cleaning frequency. The key to getting maximum cleaning power out of any ultrasonic cleaner is to match that frequency as doing so will generate the most powerful ultrasonic waves possible. This will in turn allow the solution to penetrate deeper into hard to clean parts, resulting in a more thorough clean done in less time. TruSonik ultrasonic cleaners are the only cleaners in their price point to offer a built-in automatic frequency micro-adjustment feature (also known as Frequency Sweep), allowing you to get the maximum cleaning action from whatever solution you choose.
Not only can you maximize the effectiveness of your cleaning solutions but with double the heating power of competitors your solution will reach optimal cleaning temperature quicker, further saving you time. Also, unlike on some models, the built in heater can be independently controlled from the ultrasonic transducers, meaning you can preheat your solution without putting unnecessary run-time on the unit. Speaking of run-time, TruSonik cleaners have the necessary internal components to allow for 55 minutes of continuous cleaning, almost twice as long as the competitors 30 minute max cycle time.
Specifications
Ultrasonic Cleaning Power: 240W
Ultrasonic frequency: 38-42Khz
Heating power: 200W
Adjustable Temp: 20-65C / (68-149F)
Digital Timer: 5-50 min (+/-5 min int.)
Tank capacity: 10L (2.5 gallon)
Tank dimensions 11-3/4" x 9-1/2" x 6" (300mm x 240mm x 153mm)
Construction: 316 Stainless Steel (tank), 304 Stainless Steel (body)
Overall outer dimensions (L x W x H): 12-1/2" x 12-1/2" x 10-1/2" ( 318mm x 318mm x 267mm)
Power supply: 100 ~ 120 Volts AC, 50/60 Hz
CE & RoHS approved