Instruments used to determine volume, distance, dimensions, and time are all measuring devices. The device that people are most familiar with is the gas pump. Inside the cabinet is a meter that determines the quantity of fuel dispensed. Standards Specialists test each meter by dispensing five gallons at the fast (or open) speed then five gallons at the slow (restricted) speed into calibrated measures, compare the monetary computations, check that the tamper-proof seal on the meter adjustment is intact, and other details required in the Examination Procedure Outline distributed by Measurement Standards. Other measuring devices include taximeters, wire and rope meters; wholesale water meters; oil meters; timers in car washes, laundromats, parking garages, milk tanks and propane meters. Each meter type requires it's own special test equipment; a taxi test wheel; calibrated tape measures; test vessels and a stopwatch.
Utility meters such as electric, gas, and water, used in mobile home parks are routinely tested. Each examination tests the meters ability to accurately register at full and light loads and other specifications (as outlined in the EPO). The installation of the meter directly affects performance. Wiring and meter connections are vital to correct metering of electricity, while plumbing and level installations of gas vapor and water meters are important to their accuracy. The computations of bills, using correct rate schedules, is also verified.
Calibrations can be either dry or liquid. We test our field standards against our office standards to maintain a chain of accuracy. Our standards are verified by California Measurements periodically for accuracy.