Measuring instruments

class of mass spectrometric instrument

astronomical device

device used to measure plasma

Handheld electronic test equipment

thumb|Oldham EX2000 portable explosimeter An explosimeter is a gas detector which is used to measure the amount of combustible gases present in a sample. When a percentage of the lower explosive limit (LEL) of an atmosphere is exceeded, an alarm signal on the instrument is activated.

technique in crystallography

thumb|right|A phoropter can measure refractive error to determine an individual's spectacle lens prescription during an eye examination. thumb|right|Side of a phoropter that faces the patient

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type of gas detector

radar system

device that controls gas flow

equipment used in testing of radio frequency circuits

thumb|right|A Brabender farinographthumb|right|Mechanical farinograph In baking, a farinograph measures specific properties of flour. Its underlying principles were first introduced in 1912 by Hungarian chemist Jenő Hankóczy, and the instrument was later industrialized and launched in 1928 by Carl Wilhelm Brabender in Germany. The farinograph is a tool used for measuring the shear and viscosity of a mixture of flour and water. The primary units of the farinograph are Brabender Units, an arbitrary unit of measuring the viscosity of a fluid.

component of measurement error that is caused by imperfection in the measuring instrument being used

Actigraphy is a non-invasive method of monitoring human rest/activity cycles. A small actigraph unit, also called an actimetry sensor, is worn for a week or more to measure gross motor activity. The unit is usually in a wristwatch-like package worn on the wrist. The movements the actigraph unit undergoes are continually recorded and some units also measure light exposure. The data can be later read to a computer and analysed offline; in some brands of sensors the data are transmitted and analysed in real time.

technique of measuring distances with a telescopic instrument

The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the Sun or Moon. When observing the Sun, users kept the Sun to their back (hence the name) and observed the shadow cast by the upper vane on a horizon vane. It was invented by the English navigator John Davis, who described it in his book ''Seaman's Secrets'' in 1594.

whole-body imaging device

optical test for curved mirrors

thumb|Scientist making a magnetic survey (archaeology)|magnetic survey with an axial gradiometer. A gradiometer measures the gradient (numerical rate of change) of a physical quantity, such as a magnetic field or gravity.

device that shows a ship rudder's current position

device for measuring magnetic susceptibility

corrosion test method

field-effect transistor used as a sensor for measuring chemical concentrations in solution.

A microprobe is an instrument that applies a stable and well-focused beam of charged particles (electrons or ions) to a sample.

type of mass spectrometry detector

technique to determine the density of fluids

A penetrometer is a device to test the strength of a material.

thumb|Profile view of upstream slots thumb|Profile view of downstream averaging holes The Annubar primary element is an averaging Pitot tube manufactured by Rosemount Inc. used to measure the flow of fluid in a pipe.

thumb|Dasymeter at standard pressure thumb|Dasymeter at reduced pressure thumb|Historical drawing of a dasymeter (in German: "Fig. 109. Baroscope. (Apparatus for proving the buoyancy of air)")

scientific device used to study motion in a low friction environment

Instrument used for measuring the thickness of the concrete cover above reinforcement bars

Ghanaian weight made of brass used by the Akans

thumb|Contraves cinetheodolite electro-optical tracking system dome thumb|The Air Force Space Command commander sits in a cinetheodolite at the [[Cape Canaveral Air Force Station]] A cinetheodolite or kinetheodolite is a photographic instrument for collection of trajectory data. It can be used to acquire data in the testing of missiles, rockets, projectiles, aircraft, and fire control systems; in the ripple firing of rockets, graze action tests, air burst fuze tests, and similar operations. Cinetheodolites provide angular measurements of the line of sight to the vehicle. This permits acquiring

thumb|A ''ch'ŭgugi at Jang Yeong-sil Science Garden in [[Busan]] '''Ch'ŭgugi''' () were rain gauges invented and used during the Joseon dynasty of Korea. They were invented and supplied to each provincial office during the reign of King Sejong the Great. As of 2010, only one ch'ŭgugi remains, known as the Geumyeong Cheugugi (), which literally means "ch'ŭgugi'' installed on the provincial office's yard." It is designated as National Treasure #561 of Korea and was installed in the provincial office of Gongju city, 1837 by King Yeongjo. In addition, the official measure of rainfall by ''ch'ŭgugi

thumb|Arc Auxanometer An auxanometer (Gr. ''= "to grow" + metron''= "measure") is an apparatus for measuring increase of growth in plants.

REDIRECT Hydrometer#Alcoholometer

A dynameter is an instrument that measures the magnification of a telescope. It is usually a double-image micrometer used to measure the diameter of the image of the object glass. The magnifying power is found by comparing the actual diameter of the glass with the measured diameter of the image of the glass. thumb|350px|left|thumb|350px|center|

thumb|Two grindometers, one for 0 to 15 μm and one for 0 to 100 μm A grindometer is a device used to measure the particle size of suspensions, typically inks such as those used in printing, or paints. It consists of a steel block with a channel of varying depth machined into it, starting at a convenient depth for the type of suspension to be measured, and becoming shallower until it ends flush with the block's surface. The depth of the groove is marked off on a graduated scale next to it. The suspension to be tested is poured into the deep end of the groove, and scraped towards the shallow end

thumb|right|250px|The Becquerel phosphoroscope (1873-1874) A phosphoroscope is piece of experimental equipment devised in 1857 by physicist A. E. Becquerel to measure how long it takes a phosphorescent material to stop glowing after it has been excited.

A spin exchange relaxation-free (SERF) magnetometer is a type of magnetometer developed at Princeton University in the early 2000s. SERF magnetometers measure magnetic fields by using lasers to detect the interaction between alkali metal atoms in a vapor and the magnetic field.

electronic instrument used to measure the frequency of radio waves

instrument

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device used during weaving to keep the width of the cloth constant

scientific instrument to measure magnetic properties

device which indicates whether a physical shock or impact has occurred

thumb|Drawing of a Potometer A potometer (from Greek ποτό = drunken, and μέτρο = measure), sometimes known as transpirometer', is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through transpiration. The causes of water uptake are photosynthesis and transpiration.

optoelectronic temperature sensing device

use of customizable software and modular measurement hardware to create user-defined measurement systems, called virtual instruments

device in signal processing

thumb|right|Microdensitometer

nautical instrument

chemical analysis technique

scientific instrument used to measure carbon

ion source used in mass spectrometry

atom-based relative location determining system

process of collecting and measuring the components of air pollution