[tachometers, speed meters, accelerometers,] pressure meters, [photometers, luminoflux meters, illuminometers, refractometers, hygrometers, calorimeters,] flowmeters, level gauges, level sensors, densimeters, concentration meters, gravimeters, viscosimeters, [vibration gauges, dynamometers, metal or resin ships logs recorders, gauge comparators, interferometers, angle dividing apparatus, calibration checking apparatus,] clinometers, [angle gauges, pressure automatic control apparatus, vacuum automatic control apparatus, fluid flow automatic control apparatus, liquid level automatic control apparatus, fluid composition automatic control apparatus, automatic combustion control apparatus;] program-controlling apparatus, namely, electronic computer-controlled sequencers computer program program-controlling instruments used to measure voltage current flow and electrical resistance,[ hydrophones,] applied ultra-sonic echo sounders, [applied ultra-sonic flaw detectors, magnetic object detectors,] electronic computers, thermometers, [planimeters, gas meters, water meters,] level indicators, remote control and telemetering apparatus, distance measuring apparatus used to measure a moved distance or position of a crane or distance between two buildings, metal or resin capacitors apparatus[, detectors used to detect the rotating rate or rotation angle of a motor, internal pressure and temperature of boilers, and the position and displacement of pistons, electrical circuit testers, apparatus, oscillographs, recorders used to record variation of voltage and current on a recording paper or a magnetic tape]