A professional who collects and assists in evaluation of data obtained in testing petroleum fuels and lubricants under simulated operating conditions. Responsibilities include:

• Inspects engines after test runs have been made by test-engine operator, for wear, deposits, and defective parts, using microscope and precision weighing and measuring devices to obtain accurate data.
• Records findings and assists in analyzing data.
• Assists in dismantling and reassembling engines during test runs.
• May obtain and analyze samples of engine-exhaust gas.