DIY Supplies : ELECTRICALCertification : NONEModel Number : SA-987SMeasure Range: : 0~19.99pptResolution: : 0. 01pptAccuracy: : 2%F.SOperating Temperature: : 0~50Temperature Compensation: : 0~50Power Supply: : 4X15V(AG13)(not included)Dimension : 170mm*33mm*20mmweight : 69gSA-987S pen-type Salinity meter Tester Salinometer for waterproof Salt Water Pool & Fish Pond Testing 0-19.99 ppt 40% OffSpecifications:Measure Range:0~19.99pptResolution::0.1%Accuracy:2%F.SOperating Temperature:0~50Temperature Compensation:0~50Power Supply: 4X1. 5V(AG13)(Not included)Dimension:170mm33mm20mmWeight: 69gOperation:1. Remove the protective cap.2. Turn the meter on by pressing the ON key.3.Immerse the meter in the solution to be testedWithout exceeding the maximum immersion level.4. Stir gently and wait for the reading to stabilize.5. Press the"HOLD"key, the reading is be kept. When repeatmeasuring, please press the"HOLD"key again, it automaticallyrelieves the hold condition.6. After use, turn the meter off by pressing the OFF key. Rinsethe electrode with distilled water to minimize contaminationReplace the protective cap after use.Calibration:Immerse the electrode into the distilled water and activate it about five minuts.Immerse the electrode in the calibration solution(6. 44ppt at 25).gently shake it and wait for a stable display Regulate the trimmerwith the screwdriver provided until display shows"6.4"at buffersolution temperature of 25.Rinse the electrode with distilled water, and dry it with filter paper.Immerse the electrode in the calibration solution(1382ppm at 25), gently shake it and wait for a stable display.The showing value and buffer solution's value is within error range.Important Notice:Stir gently the electrode when operating. Dont let some blebon the electrode.For guarantee the measure accuracy, please don't re-calibrateit optionally.In case of abnormal phenomena such as high measured deviationblinking measured value, no zero resetting, etc, please immersethe electrode in alcohol for cleaning.