Mettler Toledo AT20 analytical balance

Brand : Mettler

Product Code : SKU 0663C BALANCE

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All products ship from our 30,000 sq. ft. Haverhill, MA warehouse

Mettler Toledo AT20 analytical balance

Mettler Toledo AT20 analytical balances have been a consistent seller for many years, and with good reason. These balances are easy to use and feature quick warm up time, auto and manual draft shield options, and up to ten selectable weighing units.

Mettler AT20 balance features

22g capacity
Readability to 2ug
Fully automated self-adjustment
90 day warranty

The Mettler AT20 also includes proFACT three-point self-calibration program. Any time the balance senses a change in ambient temperature, two motor-driven internal calibration weights automatically adjust the linearity of the balance with reference to three fixed points across the weighing range. In other words, the balance automatically self-calibrates as needed in order to provide accurate weighing despite temperature fluctuation.

In addition to the proFACT, the Mettler Toledo AT20 has easy to use menu operated calibrations: motorized internal calibration, including linearity calibration, by built in 2 standard weights and external calibration by 20g weight. Balance operating menu allows to adapt the balance to weighing conditions, select calibration function, weighing process adapter, repeatability, auto zero correction, primary and alternative weighing units and interface output parameters.

Testing

This Mettler Toledo AT20 analytical balance is used and reconditioned. Our technicians test balances to ensure repeatability, correct cornerload tolerances, linearity, and reduced span at or near full capacity. We also test all displays and controls as well as any other features that are included, such as auto-calibration and draft shield auto-retraction, to make sure the balances are fully operational.

Click Here to see the Mettler Toledo AT20 analytical balance on the American Instrument Exchange YouTube channel.

Mettler Toledo AT20 Specifications

Readability/Capacity	2ug, 20g
Repeatability (full load)	4ug
Linearity	+/- 10ug
Stabilization Time	14 seconds
Built-in adjustment weights	2 x 10g

Please call or email us today for pricing and additional information regarding analytical balances.

Pictures

The photos of the Mettler Toledo AT20 above are representative. Please bear in mind that the equipment shown is currently in storage in our warehouse. In addition to testing each machine we will clean all the equipment thoroughly prior to shipment.

We often have multiple units of each model in stock and sometimes we're unable to feature photos of every single unit. At your request, we can provide photos of the equipment in your order after testing and cleaning.

Testing Procedures for Used and Refurbished Laboratory Balances

Ensure Precision, Repeatability, and Weighing Accuracy

Used and refurbished laboratory balances from American Instrument Exchange undergo thorough, multi-point testing to ensure accurate, reliable performance in scientific, industrial, and pharmaceutical settings. Each balance is carefully inspected, calibrated, and evaluated to meet the stringent standards required for analytical, precision, and micro weighing applications.

Why Testing Used Laboratory Balances Is Essential

Before a laboratory balance is placed back into service, it must be rigorously tested for:
• Weighing accuracy across full capacity range
• Repeatability and linearity
• Load cell and sensor functionality
• User interface and calibration system integrity

Comprehensive balance testing helps eliminate measurement errors and guarantees performance in high-precision environments such as R&D, formulation labs, and quality control facilities.

Our structured balance testing protocol ensures every refurbished unit delivers consistent results and trusted performance.

Key Testing Procedures for Refurbished and Used Laboratory Balances

1. Initial Visual Inspection

• Inspect housing, leveling feet, draft shield, and weighing pan for wear, cracks, or corrosion
• Check control panel, power cord, and buttons for damage or signs of tampering
• Confirm presence and condition of all required components (e.g., shields, adapters, trays)

2. Functional Startup and Interface Testing

• Power on the balance to verify display initialization and zeroing functionality
• Test user interface responsiveness, menu access, and programmable features
• Evaluate stabilization time and auto-tare functions

3. Calibration and Accuracy Testing

• Perform internal calibration (if equipped) and verify operation
• Use certified calibration weights to perform external calibration
• Check for accuracy at multiple weight points across the balance’s range

4. Repeatability, Linearity, and Corner Load Testing

• Conduct multiple weighings of identical test weights to confirm repeatability
• Test linearity by weighing at low, mid, and high points across the range
• Evaluate corner-load accuracy by placing test weights at different positions on the pan

5. Load Cell and Sensor Integrity Verification

• Test load cell response for consistency, drift, or hysteresis
• Verify sensor functionality and precision at sub-milligram levels (for analytical/microbalances)

6. Electrical Safety and Grounding Checks

• Inspect wiring and power components for safety and compliance
• Verify proper grounding and electrical insulation to meet lab equipment standards

7. Final Quality Assurance and Documentation

• Perform a full operational test under simulated lab conditions
• Record and document all calibration results and test metrics
• Final cleaning and inspection before shipping

Trusted Performance from American Instrument Exchange

All refurbished laboratory balances from American Instrument Exchange are tested and validated to deliver precision weighing performance from day one. Our expert technicians use industry-standard procedures to ensure each balance is lab-ready—whether used for sample prep, formulation, or high-precision research.

Repair and Refurbishment Protocol for Used Laboratory Balances

Precision Weighing Restored by American Instrument Exchange

At American Instrument Exchange, every used laboratory balance is subjected to a multi-step refurbishment protocol designed to restore precision and reliability with laboratory standards. Whether it’s an analytical balance, precision balance, or microbalance, we ensure each unit delivers consistent performance for scientific, pharmaceutical, and industrial applications.

Why Choose a Refurbished Laboratory Balance from American Instrument Exchange?

• Fully tested for accuracy, repeatability, and calibration stability
• Backed by a warranty
• Cost-effective alternative to purchasing new balances
• Environmentally responsible through expert refurbishment and reuse
• Refurbished by technicians with extensive experience in lab instrumentation

Step-by-Step Laboratory Balance Refurbishment Protocol

Every laboratory balance from American Instrument Exchange is professionally restored through a comprehensive, multi-point process:

1. Initial Intake & Inspection

• Exterior inspection for damage, corrosion, and wear on display, housing, and leveling feet
• Visual/manual check of weighing pan, draft shield, doors, and buttons
• Documentation of missing parts, error codes, or component issues

2. Cleaning and Decontamination

• Thorough cleaning of the weighing chamber, pan, and internal components using anti-static and non-abrasive cleaners
• Removal of dust, chemical residue, and particulate buildup
• Disinfection of all surfaces

3. Mechanical and Electronic Repairs

• Replacement/repair of worn components including pans, draft shields, and buttons
• Evaluation and repair of load cells, sensors, and electronic boards
• Inspection of power supply, internal wiring, and display screen functionality

4. Calibration and Accuracy Testing

• Internal calibration mechanisms are tested (if equipped)
• External calibration is performed using certified traceable weights
• Repeatability, linearity, and corner-load accuracy are verified

5. Functional Testing and Performance Validation

• Test of user interface, menu settings, and programmable functions
• Taring, zeroing, and stability response times are evaluated
• Load-bearing accuracy is tested across the unit’s full capacity range

6. Compliance and Safety Checks

• Electrical system testing for grounding and safe operation
• Verification of leveling system and anti-vibration performance

7. Final Quality Control and Documentation

• Final inspection and multi-point accuracy verification
• Complete operational test with weight logs and calibration reports
• Full cleaning and packaging for shipment

Trust the Experts at American Instrument Exchange

With over 50 years of experience in laboratory equipment, American Instrument Exchange is a trusted source for precision-refurbished laboratory balances. Our refurbishment protocol ensures each balance meets strict standards for accuracy and performance—ready to deliver dependable weighing results from day one.

Warranty Information

All used equipment sold by American Instrument Exchange is refurbished/reconditioned, tested to meet specifications, cleaned, and comes with a 90-day warranty from the date of shipment unless otherwise specified. New products include a warranty from the manufacturer. Your warranty is only valid if you have paid your invoice. If your invoice is over 30 days old, warranty work will not be performed until your invoice is paid in full. American Instrument Exchange is not liable for any special or consequential damages that result from the use of, or the inability to use, the materials on this site or the performance of the products,

Exceptions include international sales and items that are agreed to be sold with a lesser warranty or items that are agreed to be sold “as is.”

Should there be visible shipping damage to packaging or concealed shipping damage to item(s) supplied, buyer must communicate such damage to the delivering entity or carrier upon receipt first and to American Instrument the same day item is accepted / signed for. Failure to do so voids warranty. Customer decision to involve / procure third party or OEM service other than American Instrument or AIE assigned vendors to resolve in-warranty instrument failure or defect without first placing a service call to American Instrument voids warranty.

Return & Cancellation Policy

American Instrument Exchange will authorize the return of and issue a full refund for any equipment that is not working as represented and could not be replaced or repaired to the customer’s satisfaction by AIE or a representative of AIE during the warranty period. Returns without prior authorization and an RMA number will not be accepted.

Customers are responsible for proper packaging of the equipment and all included accessories. American Instrument will pay for insurance and shipping costs. Non-inventory items bought specifically to fill customer orders may possibly be returned, but on a case by case basis.

Customers who cancel orders after refurbishing has begun or after delivery where there are no equipment performance issues may be subject to a Restocking/Cancellation Fee of 20% or more and responsible for shipping costs for both the delivery and return.

Ongoing and Extended Support Options

American Instrument Exchange is able to provide additional repair and support services outside the warranty terms for most products that sell.

For biosafety cabinets, clean benches, chemical fume hoods, and other clean air products our team at AIE Laboratory Services can provide certifications, repairs, decontaminations, and other services for customers throughout New England, and guidance and limited technical assistance for any customers in the US and Canada for new or refurbished biosafety cabinets purchased from American Instrument Exchange.

For all other products, the repair service team at American Instrument Exchange can provide both field and depot repair evaluations. We can easily schedule and coordinate the pick-up and transportation of your malfunctioning equipment. By offering hourly rates lower than most OEM service providers and eliminating travel time for technicians, we help reduce repair costs. Furthermore, our lab depot repair service minimizes or eliminates scheduling delays. Our experienced service technicians are qualified to restore your equipment to factory specifications.

Please contact our team at info@americaninstrument.com for more details.

FAQ

Does the equipment come with a warranty?

Yes, all equipment from American Instrument Exchange comes with a warranty.
Used/reconditioned/refurbished equipment is tested to make sure it operates to the manufacturer's specifications and comes with a 90-day warranty (unless otherwise noted). New equipment comes with a warranty from the manufacturer.

How do you test and recondition the equipment?

Testing requirements vary across all the equipment categories we sell. Temperature controlled units are tested with NIST traceable probes and data loggers. Gaskets, external housing, glass, handles, controls and control screens are all thoroughly inspected for integrity and functionality.
We test all equipment using the manufacturer's parameters and specifications to confirm that the unit operates properly.

How do products ship from American Instrument Exchange?

We can ship products both nationally and internationally using a well-established network of transporters. Smaller items will ship via UPS. Larger equipment will be palletized and shipped either LTL or air-ride, depending on the specific equipment and/or delivery requirements.

Return and order cancellation policy

American Instrument Exchange will accept the return of any product that is not working as represented and could not be replaced or repaired to the customer's satisfaction during the warranty period. Customers who cancel orders after refurbishing has begun will be subject to a cancellation and restocking fee of between 20% and 40%.

Are discounts available for educational or non-profit institutions, or for bulk purchases?

Yes – call or email us today with a list of equipment you're looking for and we can potentially put together a quote that includes a discount.

How does your price matching policy work?

We strive to keep our pricing competitive and reasonable. If you find comparable items for sale at a lower price from other vendors please send us a link and or quote for the item and we'll do our best to match or beat the price.

Can I see the equipment in person before committing to a purchase?

Customers are welcome to make an appointment to view equipment in our warehouse. Given our workload we may not be able to test or clean the equipment prior to your arrival if you have not committed to an order.

1023 Western Avenue is a working warehouse, not a showroom, and customers should dress appropriately and wear closed toe shoes.

Can I ship products that I purchased elsewhere to American Instrument for repair?

Yes – please see our repair services page for more information.