The 18th century observatory, Jantar Mantar, built by Jai Singh II in Jaipur, Rajasthan, India, Asia

Jantar Mantar, Jaipur, Rajasthan, India, Asia

Jantar Mantar, Jaipur, Rajasthan, India, Asia

Jantar Mantar, Jaipur, Rajasthan, India, Asia

The Nadivalaya Yantra equatorial instrument at Jantar Mantar, The Observatory in Jaipur, Rajasthan, Northern India

The Nadivalaya Yantra equatorial instrument at Jantar Mantar, The Observatory in Jaipur, Rajasthan, Northern India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Student using a clinometer to measure the height of a tree.

Signal Corps Checks Weather Balloon, 1918

Rain Gauge, 1930

Launching Weather Balloon, 1944

Launching Pilot Balloon, 1944

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Frozen measure instrument overlooking Lake Constance, Mt. Saentis, Switzerland, Europe

Pressure gauge, above 3000 bar, cold-cutting process with high pressure water jet technology, test series in the Underwater Technology Centre at the Leibniz University Hannover, manufacture of bone screws for medical applications, with over 3000 bar press

Speeding driver, radar speed control camera on the Inn Valley motorway A12 in the direction of Kufstein shortly before Innsbruck, Austria, Europe

Satellite in front of the globe with Europe, symbolic image Galileo navigation system, overhead intelligence, data transmission

Radio telescope, St. Croix island, U.S. Virgin Islands, United States

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Spirit level or bubble level

Caliper gauge

Velocimetry, velocity measurement with a laser gun, RIEGEL FG21-P

Meteorological station on Rittnerhorn mountain above Ritten, Bolzano area, province of Bolzano-Bozen, Italy, Europe

Optician's equipment to control eyes, preliminary examination of the eyes for the fitting of contact lenses

Spirit level or bubble level

Meter reading of electricity meter

Measuring device for determining percentage of alcohol, Aalborg Akvavit spirits factory, Aalborg, North Jutland, Denmark, Europe

Km 0, the center of Madrid, Plaza Puerto del Sol square, Madrid, Spain, Europe

Frozen little weather station, Mt. Saentis, Switzerland, Europe

Meter reading of electricity meter

Weather station on Mt. Rittnerhorn above the Renon, Bolzano Area, South Tyrol, Italy, Europe

Close-up of speedometer

Instrument for measuring soil humidity at research station ?La Selva? in Puerto Viejo de Sarapiqui, Costa Rica