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Extech Conductivity Meter, case and probes, FREE SHIPPING,

BC Biomedical Model 1726 Digital Tachometer

Yellow Springs Instruments YSI 32 Scientific Division Conductance Meter

Extech Instruments Handheld Digital Photo Tachometer

EXTECH Instruments HW30 HeatWatch Humidity and Temperature Stopwatch

Extech Instruments Handheld Digital Photo Tachometer