A professional who tests accuracy of gas flowmeters, using testing apparatus. Responsibilities include:

• Inserts measuring orifice disk between flanged ends of two metal pipe sections and connects pipe sections with bolts and nuts.
• Fastens one end of pipe to gas main leaving flowmeter and attaches rubber hose to free (discharge) end of pipe to deflect air currents.
• Sets frame containing manometer instruments on tripod and connects instruments to nipples on pipe and to flowmeter with rubber tubing.
• Reads instruments to obtain data, such as specific gravity and temperature of gas, and clocks number of seconds required for specified volume of gas to pass through meter.
• Computes accuracy of meter, using mathematical formulas based on readings and clocking tests and standard data stamped on orifice disk, and verifies calculations, using tabulated chart.
• Adjusts meters to correct inaccurate readings.
• May change recording charts on gas flowmeters.