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Home » Scale Calibration

Scale Calibration Service

Whether you need standard scale calibration, or ISO 17025 accredited scale calibration, the Michelli team can help. Our expert scale technicians are state licensed & trained on both Handbook 44 standards and manufacturer service specifications. With service areas in 11 states, a fleet of heavy duty test trucks & a team of local experts, we’re here to help with preventative maintenance, emergency scale service, scale calibration & equipment purchase or rental.

Michelli Weighing & Measurement technician uses a remote to lower test weights onto test cart to perform preventative maintenance on scale

What is weight measurement?

Weight is the measurement discipline used to describe the heaviness or mass of an object. The “weight” of an object actually conveys the force that gravity exerts upon the object being weighed. This is why astronauts aboard a space shuttle seem to be “weightless” as they float freely through the air. Without gravity, weight cannot be determined. In the U.S., weight is expressed in pounds. Scales determine weight, and range in capacity from light to heavy. Industrial scales, such as rail scales or truck scales are considered heavy capacity, while high precision scales, such as counting scales, are considered light capacity.

Michelli Weighing & Measurement technicians perform scale calibration on site
Michelli Weighing & Measurement heavy duty test truck is used to perform truck scale calibration

What does scale calibration entail?

During scale calibration, the Michelli Weighing & Measurement scale technicians use certified test weights, which have been assigned a known value, to test the scale. The weight reading, or weighment, produced by the scale as a result should equal the known value of the test weight. Scale calibration is performed to standards outlined in the latest edition of NIST Handbook 44. (NIST Handbook 44 outlines specifications, tolerances & other technical requirements for weighing & measuring devices. – according to

If the weighment produced by the scale being calibrated does not equal the known value of the certified test weight, the scale is out of tolerance. In that case, the scale technicians will adjust the scale until the reading produced when the test weights are placed upon the scale accurately depicts the known value of the test weights.

The Michelli Weighing & Measurement heavy-duty test trucks are used for heavy capacity scale calibration, such as truck scale calibration & rail scale calibration. The heavy-duty test trucks contain heavy-duty test carts & thousands of pounds of certified test weights. Utilizing a hydraulic lift system, the scale technician removes the test cart from the truck, before loading it with test weights. The amount of weight loaded onto the test cart depends on the guidelines given in NIST Handbook 44 for a scale of that particular size & capacity.

Here are some of the scale calibration services Michelli Weighing & Measurement offers:

Bench scale calibration
Floor scale calibration
Drum-filler system calibration
High-speed grading system calibration
Tank/hopper scale calibration
Truck scale calibration


Rail scale calibration
Counting scale calibration
Checkweigher calibration
In-Motion scale calibration
Light capacity scale calibration
Heavy capacity scale calibration
Forklift scale calibration
Michelli Weighing & Measurement technicians calibrate a scale using a 500 lb weight

Click to view our ISO/IEC 17025 accreditation certificates.

While standard calibration is available on-site or in our laboratories, ISO/IEC 17025 calibration is only available in one of our ISO 17025 accredited laboratories.

Michelli Weighing & Measurement offers scale calibration on all makes & models, from precision counting scales to heavy capacity rail scales.

Interested in shipping your equipment in for calibration?

Please download our easy-fill equipment list here, print and ship it with your equipment to your nearest location. (Addresses available here.)

Contact Us

Forklift scale calibration in progress