SA-987S pen-type Salinity meter Tester Salinometer for waterproof Salt Water Pool & Fish Pond Testing 0-19.99 ppt 40% Off Specifications: Measure Range: 0~19.99ppt Resolution::0.1% Accuracy:2%F.S Operating Temperature:0~50 Temperature Compensation:0~50 Power Supply: 4X1. 5V(AG13)(Not included) Dimension:170mm33mm20mm Weight: 69g Operation: 1. Remove the protective cap. 2. Turn the meter on by preing the ON key. 3.Immerse the meter in the solution to be tested Without exceeding the maximum immersion level. 4. Stir gently and wait for the reading to stabilize. 5. Pre the"HOLD"key, the reading is be kept. When repeat measuring, please pre the"HOLD"key again, it automatically relieves the hold condition. 6. After use, turn the meter off by preing the OFF key. Rinse the electrode with distilled water to minimize contamination Replace 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 trimmer with the screwdriver provided until display shows"6.4"at buffer solution 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 bleb on the electrode. For guarantee the measure accuracy, please don't re-calibrate it optionally. In case of abnormal phenomena such as high measured deviation blinking measured value, no zero resetting, etc, please immerse the electrode in alcohol for cleaning.