Actinometer - Radiation intensity
Almucantar - Bearing and altitude of celestial bodies
Altimeter - Altitude
Anemometer - Wind speed or flow rate of a fluid
Atmometer, Evaporometer - Rate of evaporation
Baroscope, Barometer - Atmospheric pressure
Bathometer - Depth of water in the sea
Beckman Thermometer - Small changes in temperature
Callipers - Diameters of rods or tubes
Calorimeter - Heat
Cathetometer - Distances between fluid levels in vertical tubes
Chronometer - Precise time
Clinometer - Angle of an incline
Colorimeter - Colours, concentration of solutions by comparison of colours
Crookes Radiometer - Intensity of radiated light
Cryometer - Very low temperatures
Cyclometer - Distance travelled by a wheel
Densimeter - Density
Densitometer - Optical density - degree of transparency
Dilatometer - Volume expansion of liquids with temperature change
Electrometer - Potential difference and charge
Electroscope - Presence of an electric charge
Gaussmeter - Magnetic flux density
Geiger counter - Radiation
Goniometer - Angles, in crystals
Gravimeter - Gravitational field
Hydrometer - Relative densities of liquids
Hygrometer - Humidity
Hypsometer - Land elevation
Interferometer - Wavelengths of light
Machmeter - Speeds at and beyond the speed of sound
Magnetometer - Strengths of magnetic fields
Manometer - Pressures of gasses and liquids
Micrometer - Precise dimensions of small distances or angles
Octant - Altitude of celestial bodies
Ondometer - Frequency of radio waves
Optometer - Refraction of the eye
Orometer - Height above sea-level
Pedometer - Distance travelled by a walker
Photometer - Light intensity
Piezometer - High pressures, compressibility
Planimeter - Surface area of a plane figure
Pluviometer - Rainfall
Polarimeter - Optical rotation of polarised light
Potentiometer - Voltage or Potential difference
Protractor - Angles
Psychrometer - Humidity
Pycnometer - Relative densities of liquids and solids
Pyrheliometer - Solar radiation
Pyrometer - High temperatures
Radiomicrometer - Heat radiation
Saccharometer - Sugar content in a solution
Salimeter - Salt content in a solution
Scintillation counter - Ionising radiation
Sclerometer - Hardness of material
Seismograph - Earth tremors
Sextant - Altitude of celestial bodies
Spectrometer - Octial spectra
Spherometer - Curvature of a sphere or cylinder
Sphygmomanometer - Blood pressure
Sphygmometer - Strength of the pulse
Steelyard - Weight of heavy loads
Tacheometer - Distances, elevations and bearings
Tachometer, Rev counter - Speed of rotation of a shaft
Tasimeter - Small changes in temperature
Tellurometer - Distances, up to 40 miles
Tensiometer - Tensile strength, stretchability
Theodolite - Vertical and horizontal angles, and so distances and elevations
Variometer - Rate of change of altitude of an aircraft
Velocimeter - Velocity or speed
Vinometer - Alcohol content of wine