Well sounder constructed using an open reel tape measure.

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Chemical method of water flow measurement in open channels

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Englund Marine OPEN REEL TAPE MEASURES

Tape Measure Open Reel Clear Metric Tape Measure for Engineer

Non-Contact Ultrasonic Water Level Sensor

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The WLM810 is a portable water level measuring instrument, commonly used to measure static water level in Groundwater wells or Boreholes. This

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Water Level Meters - Soil Instruments