Test or repair mobile or stationary radio transmitting and receiving equipment and two way radio communications systems used in ship to shore communications and found in service and emergency vehicles.

Install or repair solar energy systems designed to collect, store, and circulate solar heated water for residential, commercial or industrial use.

Help roofers by performing duties requiring less skill. Their duties include using, supplying or holding materials or tools, and cleaning work area and equipment.

Apply interior or exterior plaster, cement, stucco, or similar materials. They also set ornamental plaster.

Assemble, install, or repair pipes, fittings, or fixers for heating, water, or drainage systems, according to specifications or plumbing codes.

Inspect agricultural commodities, processing equipment, and facilities, and fish and logging operations, to ensure compliance with regulations and laws governing health, quality, and safety.

Prepare, sterilize, install, or clean laboratory or healthcare equipment. They perform routine laboratory tasks and operate or inspect equipment.

Conduct tests to determine quality of raw materials, bulk intermediate and finished products. They conduct stability sample tests.

Use x ray, ultrasound, fiber optic or related equipment to test the safety of structures, vehicles, or vessels.

Operate, install, calibrate, and maintain integrated computer or communications systems, consoles, simulators, and other data acquisition, test, and measurement instruments and equipment, which are used to launch, track, position, and evaluate air and space vehicles. They record and interpret test data.