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2. Nephelometer - Wikipedia

   en.wikipedia.org/wiki/Nephelometer

   The unit is called Formazin Turbidity Unit (FTU). Nephelometric Turbidity Units (NTU) specified by United States Environmental Protection Agency is a special case of FTU, where a white light source and certain geometrical properties of the measurement apparatus are specified. (Sometimes the alternate form "nephelos turbidity units" is used [7] [8])

3. Turbidity - Wikipedia

   en.wikipedia.org/wiki/Turbidity

   Turbid creek water caused by heavy rains. The measurement of turbidity is a key test of both water clarity and water quality. [citation needed] There are two standard units for reporting turbidity: Formazin Nephelometric Units (FNU) from ISO 7027 and Nephelometric Turbidity Units (NTU) from USEPA Method 180.1.

4. Wastewater quality indicators - Wikipedia

   en.wikipedia.org/wiki/Wastewater_quality_indicators

   Settleable solids are measured as the visible volume accumulated at the bottom of an Imhoff cone after water has settled for one hour. [2]: 89–98 Turbidity is a measure of the light scattering ability of suspended matter in the water. [2]: 131–137 Salinity measures water density or conductivity changes caused by dissolved materials.

5. Extech Instruments - Wikipedia

   en.wikipedia.org/wiki/Extech_Instruments

   The company's products include thermal imagers, multimeters, clamp meters, air flow meters, light meters, sound level meters, tachometers, pressure sensors, calibration devices, water quality meters, moisture meters, humidity meters, contact and non-contact thermometers, power supplies, fiber optic meters, and EMF measurement devices.

6. Water point mapping - Wikipedia

   en.wikipedia.org/wiki/Water_Point_Mapping

   Despite its growing importance, the issue of water quality has long been nearly absent from water coverage assessments, since few countries could afford regular water quality surveillance. Instead, it is assumed that certain types of water sources categorized as 'improved' are likely to deliver drinking water of adequate quality for basic ...

7. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   pH meter: pH (chemical acidity/basicity of a solution) photometer: illuminance or irradiance planometer: area polarimeter: rotation of polarized light potentiometer: voltage (term is also used to refer to a variable resistor) profilometer: surface roughness protractor: angle psychrometer: humidity pycnometer: fluid density pyranometer: solar ...