Amber Science Model 1056 Portable Electrical Conductivity EC Meter

YSI Oxygen Conductivity Salinity & Temperature Meter Model 85/25 FT. Not Tested.

Fisher Portable Battery Operated Conductivity Meter Model 152

ATORCH USB C Tester Meter, Type-C Tester Digital Multimeter 4-50V 0-12A1056

0-4000us/cm 1.0 Sensor Conductivity Meter With Relay Industrial Online EC Tester

Oakton CON 150 Waterproof Portable Conductivity Meter with New Batteries / Probe

Dr.soil 7-in-1 Soil Tester Kit NPK Temperature Conductivity Moisture EC Meter

EC20 Conductivity Pocket Tester Kit - ±1% Accuracy, 0-20 mS/cm, BPB Sensor