Compact and pocket-sized design Easy to use and provides a quick measurement High accuracy with 2 full scale accuracy Data hold function and built with Automatic Temperature Compensation (ATC) Auto power off,Pre-calibrated at factory Wide range of applications in water quality testing Supplied with a screw driver for calibration if necessary Measure Range : 0 19.99 ms cm Resolution : 0.01 ms cm Accuracy : 2 F.S. Automatic Temperature Compensation (ATC): 0 50 C (32 122 F) Operating Temperature : 0 50 C (32 122 F) Power Supply : 2pcs x CR1632 button cell batteries (not included) Item size : approx. 147 (L) x 27 (W) x 18 (D) mm 1.Remove the protective cap 2.Clean the electrode with distilled water,and suck it with filter paper 3.Turn the meter on by"ON OFF" switch 4.Immerse the meter electrode in solution up to the immersion level.Under no circumstances immerse above display level. 5.Gently stir,wait till the reading is stable,press"HOLD"key, and take the EC meter out, then use the reading figure to get the EC value 6.After use,switch off and use the distilled water to clean the electrode and replace the protective cap. 1.Immerse the meter in the distilled water.Activate it about some hours? 2.Immerse the meter in 12.88ms cm calibration solution(at 25?),and stir it gently. 3.Allow the reading to stabilize and turn the calibration trimmer with a small screwdriver untile the display shows"12.88". 4.Rinse the electrode with distilled water and suck it with tissue paper. 5.Immerse the meter in 1.41ms cm(at 25?),and stir it gently. Display value must be same as calibration solution(at 25?) or approach the value in the area of resolution Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation dueAuto power off,Pre-calibrated at factory. Data hold function and built with Automatic Temperature Compensation (ATC). High accuracy with 2 full scale accuracy. Easy to use and provides a quick measurement. Compact and pocket-sized design.