uMod-EC Introduction

Measure Electrical Conductivity in Siemens, Total Dissolved Solids in PPM, and Salinity in PSU.

An electrically isolated I2C sensor device, a waterproof temperature sensor, and an electrical conductivity probe. It measures the conductivity of a solution and converts it into Siemens (S) total dissolved solids and salinity. The firmware allows for single or dual-point calibration with temperature compensation.


  • EC range: 0.5 - 12.88 mS/cm
  • Accuracy: ± 5%
  • Temperature range: -55 - 125 C
  • Interface: I2C
  • Current use: ~10mA peak, low idle current ~1mA
  • Voltage range: 3.3 - 5.0V


measureEC - starts a measurement