Product description : *Replaceable pH electrode *Waterproof design(IP58) *LED display Aquariums PH Continuous Monitor with 1 or 2-points Calibration & Auto Buffer Recognition Technology Parameters: Measuring range:0.0~9.9PH Accuracy:±0.1PH Resolution:0.1PH Operating Temperature:0℃~50℃ Automatic Temperature Compensation:0℃~50℃ Calibration:1 or 2 points with auto buffer recognition Power Supply:6V DC (include), with adaptor Dimensions:108mm x 28mm x 18mm Weight:95g