Microprocessor based designed. Large LCD displays readings and temperature simultaneously. Rugged design with waterproof housing. It floats on water. Measuring 5 parameters: pH, Conductivity, TDS, Salinity, and temperature by just on combo electrode. Automatic Temperature Compensation (ATC). °C or °F are switchable. Memory function stores and recalls up to 150 points. MAX/MIN and data Lock (8200M only). Simple to calibrate by one keyboard for 5 points buffer. Indicate percentage of slope (PTS) after calibration Auto power shut off after 10 minutes of non use. Easy replaced electrode module.