Uses hacksaw, tube cutters, flaring tools, threading devices, solder and soldering irons, brazing and welding equipment (including high pressure nitrogen, oxygen and acetylene), high vacuum pumps, pressure and vacuum gauges, electronic meters, analog or digital volt-ohm or multi-meters, ammeters, mechanical and electronic refrigerant leak detectors, dual gauges, micrometers, Burdon & Myeloid gauges, torque wrench, reamers, valve grinders, valve reseaters, ridge reamers, fullers, plug gauges, megger, diagnostic equipment, electronic tests and repair instruments and other hand tools pertinent to the occupation. Checks, adjusts, repairs replaces and/or cleans evaporator cord compressor core and filter; compressors, expansion valves and all other electrical electronic, pneumatic and mechanical controls, switches, relays, regulators, valves, thermostats, switches, wiring and other units.