Backflow preventer test kits comprised of test equipment for measuring pressure of water backflow prevention devices and electronic devices for testing differential pressure of water backflow prevention devices; test equipment for measuring pressure of water backflow prevention devices; electronic devices for testing differential pressure of water backflow prevention devices; digital apparatus for testing water control devices, namely, vacuum breakers, check valves, vacuum breaker assemblies, check valve assemblies, pressure relief valves, reduced pressure zone devices, and reduced pressure backflow assemblies; electronic gauges for measuring water pressure differentials; water backflow assembly field test kits comprised of one or more pressure sensors, valves, one or more pressure measurement display, and at least one enclosure containing the one or more pressure sensor, valves, and one or more pressure measurement display; water backflow assembly test tools comprised of pressure sensors, backflow test kits comprised of water pressure sensors, fitting sets, bleed hose kits, compensation valves, sight tubes, hoses, grip clips, ball valve wrenches, test cock wrenches, missing handle wrenches, plastic plugs, plastic caps, O-rings, gloves and reversible screwdriver; HVACR test tools, namely, scales, pressure sensors, hygrometers, anemometers and temperature probes; HVACR field test kits comprised of one or more pressure sensors, valves, one or more pressure measurement display, and at least one enclosure containing the one or more pressure sensor, valves, and one or more pressure measurement display; Downloadable HVACR software for documenting measurements and information related to a water backflow assembly's test; Fire sprinkler field test kits comprised of test equipment for measuring pressure of water backflow prevention devices and electronic devices for testing differential pressure of water backflow prevention devices; Backflow assembly software, namely, downloadable software for documenting measurements and information related to a water backflow assembly's test