measuring instrument vs hygrometer

Other hyponyms of measuring instrument include accelerometer, actinometer, algometer, altazimuth, altimeter, atmometer, evaporometer, audiometer, sonometer, barometer, bathometer, bathymeter, bolometer, buret, burette, caliper, calliper, calorimeter, chronoscope, colorimeter, tintometer, counter tube, craniometer, cryoscope, declinometer, transit declinometer, densimeter, densitometer, densitometer, dosemeter, dosimeter, dynamometer, ergometer, electrodynamometer, electroscope, eudiometer, gage, gauge, graduate, gravimeter, gravity meter, heliometer, haematocrit, hematocrit, gravimeter, hydrometer, dip circle, inclinometer, integrator, planimeter, interferometer, ionization chamber, ionization tube, katharometer, Kundt's tube, lidar, log, measure, measuring rod, measuring stick, meter, nephoscope, octant, oximeter, pedometer, pelvimeter, photometer, piezometer, pipet, pipette, Pitot-static tube, Pitot head, Pitot tube, Pitot, Pitot tube, plethysmograph, potentiometer, quadrant, microwave radar, radar, radio detection and ranging, radiolocation, range finder, rangefinder, refractometer, rheometer, scale, weighing machine, sclerometer, sector, seismograph, sensitometer, sextant, asdic, echo sounder, sonar, spherometer, spirograph, spirometer, static tube, synchroniser, synchronizer, synchronoscope, synchroscope, tach, tachometer, tape, tape measure, tapeline, tensiometer, tensiometer, tensiometer, thermometer, horologe, timekeeper, timepiece, tonometer, torsion balance, variometer, Venturi tube, viscometer, viscosimeter, wattmeter, stactometer, stalagmometer, stalogometer, oedometer, anemograph, anemoclinometer, durometer, ultrasonic pulse analyzer, ultrasonic pulse velocity tester, Abbe vertical metroscope, echograph, eriometer, archaeological planning frame, planning frame, xylometer, orograph, konimeter, flow meter.