Digital PH Meter PH-009 Pocket Size Water Quality pH Tester for Household Drinking Water, Hydroponics, Aquariums, Swimming Pools - Extra Two Packs of PH Calibration Solution Mixture

This digital pen style pH meter is an ideal instrument for any aquarium, the fishing industry, swimming pools, school laboratories, food & beverage etc. All inspection qualified before shipment. Factory calibrated, it can be used immediately. Please be sure to calibrate with buffer solution before use(Long time no use). Calibration: -- Immerse the tester up to the maximum immersion level in the PH 4 or 6.86 buffer solution. (Package Includes 2 pack of PH substance which makes 250 ml buffer solutions, PH 4 or PH 6.86). -- Allow the reading to stablilize and using the small screwdriver adjust the calibration trimmer to reading 6.9