High-capacity battery, powered by a large-capacity button battery, with long service life. Removable probe, corrosion resistance, long service life, fast response, and more stable data. Can display at the same time: pH and temperature values. LED blue backlight display. Wide application: soil, drinking water, cheese, milk, meat, laboratory, cosmetics. Model:ph-61181 Measuring range: 0.00 14.00pH Accuracy : 0.2PH 0.1PH Resolution: 0.01PH Operating Temperature : 0?C 50?C Automatic Temperature Compensation : 0?C 50?C Automatic Temperature Compensation : 0?C 50?C Electrode:For cheese milk testing Power Supply:3 1.5V(AG13) (Not inculde) Dimensions:175mm 51mm 25mm PH Calibration: 1.lmmerse the electrode in pH 6.86(pH7.00)standard buffer solution of phosphate,and gently shake it 2.Allow the reading to stabilize and with a small screwdriver turn the calibration trimmer until the display shows "6.86"("7.00").Rinse the electrode with distilled water,and suck it with filter paper. 3.lmmerse the electrode in a PH4.01 or PH 9.18 buffer solution,gently shake the electrode and waiting for the reading to stabilize.The showing value and buffer solution's ph value is within error range. 4.The calitbration of the instrument's pH range is now complete. Packing list: 1 Soil moisture meterWide application: soil, drinking water, cheese, milk, meat, laboratory, cosmetics. LED blue backlight display. Can display at the same time: pH and temperature values. Removable probe, corrosion resistance, long service life, fast response, and more stable data. High-capacity battery, powered by a large-capacity button battery, with long service life.