List from quadrant to wavemeter
- Quadrant uses to measure altitudes and angles in navigation and astronomy
- Radar uses to detect the direction and range of an approaching airplane by  means of radio waves like range, angle, direction, and radio
- Radiomicrometer uses to measure heat radiation
- Refractometer uses to measure refractive indices
- Salinometer uses to determine salinity of solutions
- Sextant uses by navigators to find the latitude of a place by measuring the elevation above the horizon of the sun or another star, also used to measure the height of very distant objects
- Spectroscope uses to observe or record spectra
- Spectrometer its a spectroscope equipped with calibrated scale to measure the position of spectral ines (Measurement of  refractive indices)
- Spherometer uses to measure curvature of spherical objects
- Sphygmometer uses to measure blood pleasure
- Stereoscope users to view two-dimensional pictures
- Stethoscope uses by doctors to hear and analyze heart and lung sounds
- Stroboscope users to view rapidly moving objects
- Tachometer uses to determine speed, especially the rotation speed of a shaft.
- Tacheometer, it’s a theodolite adapted to measure distances,elevations, and bearings during the survey.
- Tangent Galvanometer uses to measure the strength of direct current
- Teleprinter uses to receives and sends typed messages from one place to another
- Telemeter uses  to records physical happenings at a distant place
- Telescope users to view distant objects in space
- Thermometer uses to measure temperature.
- Thermostat uses to regulate temperature at a particular point
- Tonometer uses to measure the pitch of a sound
- Transponder users to receive a signal and transmit  a reply immediately
- Udometer uses for range gauge
- Ultrasonoscope uses to measure and use ultrasonic sound and use to make Ecogram to detect brain tumors ,heart defects and abnormal growth
- Venturimeter uses to measure the rate of flow of liquids
- Vernier uses to measure small sub-division of scale
- Viscometer uses to measure the viscosity of liquid
- Voltameter uses to measure electric potential difference between two points
- Wattmeter uses to measure the power of an electric circuit
- Wavemeter uses to measure the wavelength of a radio wave.
Also, see list of scientific instruments list -1Â
    see list of scientific instruments list -2Â