General laboratory bench pH meter, which is suitable for measuring moderate ionic strength solutions, such as surface ... and safety certification300 groupsMeasuring value series number, measuring value, temperature, ATC or MTC state, measuring date and timeDC9V/300mARS232160 × 190 × 70mm ... & USA series, NIST series and China series.4.Meter has the only product serial number.5.Dustproof and waterproof ...