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State of Washington


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Abolished Date: 2015-08-14


Independently inspects, repairs, tests, certifies, and installs portable platform scales, wheel-load weighers, small evidence scales, health scales, and motor truck scales to a capacity of 100,000 pounds. Testifies as an expert witness in courts of law.

Typical Work

Inspects, determines needed repairs, makes repairs, tests for accuracy, and certifies scales at various locations in Washington State;

Lays out work on various repair jobs, working from verbal requests, rough sketches, plans, blueprints, or own knowledge of requirements for repairs, testing, and certifications;

Installs new scale systems (electronic and mechanical), removes and replaces scales when necessary for overhaul or modifications;

Overhauls lever systems, beams, and dials in shop by refinishing or replacing pivots, bearings, tapes, frictions, and other parts. Seals levers, beams, and dials to required tolerances of accuracy by using certified test weights. Diagnosis and repairs of electronic readouts, load cells, and related apparatus;

Overhauls, tests, and certifies portable wheel-load weighers and portable platform scales: electronic, hydraulic, and mechanical;

Operates power tools such as: grinders, sanders, drills, drill presses, gas and electric welding equipment, electronic diagnostic equipment, load-cell simulators, and scale-recharging equipment; performs skilled mechanical work;

Estimates time and materials needed to complete job;

Keeps records and makes reports of scale tests and certifications;

Testifies in court as a witness to the accuracy of scales and the theory of metrology;

Performs other work as required.

Knowledge and Abilities

Knowledge of: the principles and design of various makes of weighing devices, standard practices, methods, materials, tools, and equipment used in making repairs, overhauls, testing, and certifications. Use of gas and electric welding equipment in making repairs to the different ferrous and non-ferrous metals used in scale construction. National Bureau of Standards Handbook, 44-Specifications, Tolerances, and Regulations for Commercial and Law Enforcement Weighing and Measuring Devices.

Legal Requirement(s)

There may be instances where individual positions must have additional licenses or certification. It is the employer’s responsibility to ensure the appropriate licenses/certifications are obtained for each position.

Desirable Qualifications

Four years of experience in the installation, maintenance, and certification of motor truck scales to a capacity of 100,000 pounds or more.


Two years of college-level study in the science of metrology (science of weighing and measuring).

Note:  Valid Washington State Combination Vehicle Operator's license is required.  Extensive travel is required (80 percent or more).

Class Specification History

New class adopted effective July 14, 1989.
Revise class. Revise class code (formerly 75600), general revision; adopted May 10, 2007, effective July 1, 2007.

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