When Jenco designed the model 3020M, we took the best of the popular 3010M and increased its range and accuracy by enabling the meter to be paired with both 2-wire and 4-wire conductivity probes. Like other meters in this series, this meter is RoHS compliant, meaning it doesn’t include hazardous materials such as lead, mercury, cadmium and other materials that are harmful to the environment. 3020M can simultaneously display conductivity and temperature, salinity and temperature, and TDS and temperature, and store up to 50 sets of readings.