is a specific kind of: instrument.

is a broader term that covers: 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 | hygrometer | 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 ... show more.