This is a replacement part, not an entire unit!
Optimize nutrient strength during growth, flowering, and fruiting Same reliable waterproof dustproof housing as pHTestr.
Choose from models for TDS?or conductivity (ECTestr); 1%?accuracy.

Replacement sensors and solutions
OK-35661-17 for TDSTestr Low, High, ECTestr High
OK-35653-13 15 mS?calibration solution for High Testrs