Model PHB-7000 Range -2.00pH ~ 18.00pH -1999mV ~ 1250mV -10.0 ~ 199.9 Resolution 0.01pH, 1mV, 0.1 Accuracy +/- 0.01 pH +/-1digit +/- 1 mV +/- 0.1 +/-1digit Temperature Compensation Auto / Manual 0.0 ~ 99.9 Buffer Recognition 4.00 / 7.00 / 10.01 pH 4.01 / 6.86 / 9.18 pH Power Source 9V Adapter Audio Feedback All touch keys Dimensions 200mm X 160mm X 50mm Weight 0.45 Kg Description: Microprocessor Based Automatic Temperature Coefficient Pt-1K 64sets Automatic Data Memories Big Blue Backlight L.C.D Display Auto-calibration Auto-locked Auto-power off Welcome to contact with: AI-ON