Electronic pH meter set for water. Specification: - Range: 0,00 - 14,00 pH; - Resolution: 0,01 pH; - Accuracy: 0,1 pH; - Compensation temperature: 0°C - 50°C; - Battery: 4x 1,5V (AG-13); - Operating temperature: 0°C - 50°C; - Size: 150mm x 30mm x 20mm. Set includes: - pH test device; - 4 LR44 batteries; - Screwdriver; - Borax solution pH: 4.01; - Phosphate solution pH: 6.86. Usage instruction: 1. Remove protection cap. 2. Clean electrode with distilled water and suck it with filter paper. 3. Turn pH on using "ON-OFF" located on the top of battery cover. 4. Immerge electrode of pH meter in solution to draught level. In no case, do not immerge above display level. 5. Stir gently and wait for reading to stabilize. 6. After usage, switch it off, use distilled water to clean electrode and place protective cap. Important: Device pH range must be recalibrated: - Before every usage; - When electrode has not been used for a long time from last calibration; - If electorde has been used in particular tough conditions.