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Specification: Measure range 0.00pH - 14.00pH Resolution: 0.01pH Accuracy: +/- 0.01pH Power supply: 2 x 1.5V (keep using more than 500 hours) Operating temperature: 0 - 80 Degree Calibration: Two points automatic calibration Dimension: 153mm x 29mm x 16mm Weight: 52g Large LCD 2.6 x 1.1 cm No screwdriver needed Ideal For Both Domestic And Laboratory Usage, This Ph Meter Comes With Auto Calibration. Examine The Ph Level Of The Water With This Ph Meter This Water Resistant Ph Meter Has A Digital Display To Offer The Accuracy Of The Reading. This Digital Pen Style Ph Meter Can Be Best Suited As An Ideal Instrument For Aquarium, Fishing Industry, Swimming Pool, School Laboratory, And Food And Beverages. You Just Need To Insert It Into The Tested Solution,It Will Display The Ph Level For You. This Is An Economic Type Hand Held Ph Meter With High Precision, Digital Readout, Large Lcd Display Screen, High Sensitivity. Easy To Use With High Stability, No Need Of Frequent Adjustment. Easy To Carry. Caliberation Calibration: Turn on pH meter Immerse the electrode in pH 6.86 standard buffer solution (under the temperature of 25 degree) After digit stabilized, press the "CAL" button for 5 seconds (the instrument comes into the automatic calibration status) wait until the display digit is 6.86 pH, then complete pH 6.86 point calibration Clean the electrode with distilled water and dry it filter paper, immerse the electrode in pH 4.00 standard buffer solution After digit stabilized, press "CAL" button for 5 seconds, wait until the digit is 4.00 pH, complete the pH 4.00 point calibration Clean the electrode with distilled water and wipe clean the spare water. This instrument calibration work is completed after all steps.