Sensors designed to measure and test for changes in environmental conditions, including radiation (both wavelength and as a hazardous emission), temperature, moisture and dew point, smoke, dust and opacity, light, weather, and water quality.

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Conductivity meters, dissolved solids meters, and resistivity meters are analytical instruments that measure the conductivity, dissolved solids, and/or resistivity of a liquid sample.
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Conductivity electrodes are devices that measure the salinity and conductivity of water samples.
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Dissolved CO2 instruments are analytical devices that measure the amount of carbon dioxide (CO2) dissolved in a liquid sample such as water. They typically include a submerged probe that is covered by a thin organic membrane.
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Dissolved oxygen meters are analytical instruments that are used to measure the amount of oxygen dissolved in a liquid sample.
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Dissolved oxygen sensors are used to measure the amount of oxygen dissolved in a unit volume of water. In water quality applications, such as aquaculture (including fish farming) and wastewater treatment, the amount of dissolved oxygen (DO) must be kept high.
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Electron Multipliers (13 suppliers)

Electron Multipliers detect incident electrons, ions, vacuum UV (VUV), and soft X-ray and intensify the subsequent detected signal through secondary emission.
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Elemental Analyzers (30 suppliers)

Elemental Analyzers are used for analyzing the Carbon, Hydrogen, Nitrogen, Oxygen, and Sulfur content of organic materials.
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Gas Instruments (950 suppliers)

Gas instruments detect, monitor or analyze gases present in an environment.
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Groundwater monitoring equipment includes pumps and other instruments that tap into the water table for water quality assessment, testing for pollutants, and the identification of other compounds.
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Humidity Transmitters (179 suppliers)

Humidity transmitters provide electrical outputs that are proportional to humidity inputs. They measure variables such as relative humidity, absolute humidity, specific humidity, moisture content, dew point, temperature, and pressure.
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Hygrometers and humidity measurement instruments test for absolute humidity, relative humidity, or dew point in air.
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Ion selective electrodes measure the potential of a specific ion in solution. This potential is measured against a stable reference electrode of constant potential.
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Ion specific electrode meters are millivolt meters that interface with ion selective electrodes (ISEs). These meters take the potential generated by the electrode and convert it into units of concentration.
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Leaf Wetness Sensors (12 suppliers)

Leaf wetness sensors are used to detect the presence of surface moisture.
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Leak Testing Equipment (464 suppliers)

Leak testing equipment is used to measure the escape of liquids, vacuum or gases from sealed components or systems.
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Liquid Leak Detectors (245 suppliers)

Liquid leak detectors sense when a liquid is leaking from a pipe, tank, or other receptacle.
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Microchannel Plates (10 suppliers)

Microchannel Plates use separate channels to detect electrons, ions, or x-rays with spatial resolution.  Each channel uses secondary emission to intensify detection signals.
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Moisture Meters (798 suppliers)

Moisture meters are used to measure the moisture content in bulk solids, liquids and gases.
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Oil in water monitors are used to detect the presence of hydrocarbons in water.
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Oil sensors and oil analyzers are used in automotive or industrial machinery applications to sense oil levels, and check for contamination, and particulates, viscosity and/or temperature.
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Opacity sensors and instruments measure the amount of light transmitted through a sample.
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Oxygen reduction potential (ORP) electrodes are analytical sensors for measuring oxidation-reduction potential (ORP).
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Oxidation reduction potential (ORP) instruments measure or monitor ORP in solution.
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pH Electrodes (198 suppliers)

pH electrodes are analytical sensors for measuring potential of hydrogen (pH), the negative logarithm of the hydrogen ion activity in solution.
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pH Instruments (414 suppliers)

pH instruments are used to measure or monitor potential of hydrogen (pH) in a solution.
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pH Transmitters (54 suppliers)

pH transmitters provide electrical outputs that are proportional to potential of hydrogen (pH) inputs.
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Radiation Detectors (209 suppliers)

Radiation detectors are used for medical diagnoses, radioactive dating measurements, and measurements of background radiation, activity levels and radiation doses.
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Seismic Instruments (55 suppliers)

Seismic instruments are used to measure low frequency ground motion caused by earthquakes.
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Solar radiation instruments measure the spectral range of radiation, including global solar radiation (sun + sky), net radiation (incoming solar - reflected solar) and the photosynthetic light spectrum.
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Total organic carbon (TOC) analyzers measure the amount of total organic carbon present in a liquid sample.
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Turbidity Instruments (209 suppliers)

Turbidity instruments measure the average volume of light scattering over a defined angular range. Both particle size and concentration of suspended solids as well as dissolved solids can affect the reading.
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Volatile organic compound (VOC) analyzers are used to detect concentrations of heavy hydrocarbons in gas or liquid media.
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Water quality photometers and colorimeters are ion-specific, computer-interfaced probes that are designed to determine the concentration of a solution from its color intensity.
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Water quality testing instruments are used to test water for chemical and biological agents, and to measure variables such as clarity and rate of movement.
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Weather Instruments (350 suppliers)

Weather instruments are designed to measure one or multiple components of weather including wind speed and direction, rain or snow fall, solar radiation, temperature, pressure and humidity.
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