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2. Grounding resistance tester - Wikipedia

   en.wikipedia.org/wiki/Grounding_resistance_tester

   One of the most used analog grounding testers in USSR were М416. [3] From the 21st century several companies produced digital earth resistance meters and testers. The main purpose of the instrument [4] is to determine the adequacy of the grounding of an electrical system. By a standard of the National Electrical Code [5] the resistance of the ...

3. Cone penetration test - Wikipedia

   en.wikipedia.org/wiki/Cone_penetration_test

   The cone penetration or cone penetrometer test (CPT) is a method used to determine the geotechnical engineering properties of soils and delineating soil stratigraphy. It was initially developed in the 1950s at the Dutch Laboratory for Soil Mechanics in Delft to investigate soft soils. Based on this history it has also been called the "Dutch ...

4. The Best Soil Test Kits Will Help You Grow Your Perfect Garden

   www.aol.com/lifestyle/best-soil-test-kits-help...

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5. Moisture meter - Wikipedia

   en.wikipedia.org/wiki/Moisture_meter

   Moisture meters are measuring instruments used to measure the percentage of water in a given substance, as physical properties are strongly affected by moisture content and high moisture content for a period of time may progressively degrade a material. Meters exist for various substances, including wood, building materials, concrete, and soil.

6. Penetrometer - Wikipedia

   en.wikipedia.org/wiki/Penetrometer

   There are many types of penetrometer designed to be used on soil. They are usually round or cone shaped. The penetrometer is dropped on the test subject or pressed against it and the depth of the resulting hole is measured. The measurements find whether the soil is strong enough to build a road on.

7. TDR moisture sensor - Wikipedia

   en.wikipedia.org/wiki/TDR_moisture_sensor

   A TDR waveguide with exposed wires. In the waveform analysis a sensor (usually a probe) is placed in the material to be tested. The sensor contains a waveguide consisting of two, three, or more parallel wires which is connected via a coaxial cable to a voltage pulse generator which sends precisely defined voltage pulses into the sensor.