ORP169F Digital ORP Tester Waterproof ORP Meter 0 ~ ±1999mV Water Quality Tester for Aquarium and Swimming Pool

Good luck with your favorite purchasesORP169F Digital ORP Tester Waterproof ORP Meter 0 ~ ±1999mV Water Quality Tester for Aquarium and Swimming Pool Range: MV 0~±1999mVResolution: MV  1mVAccuracy: MV  ±5mVBattery: 4×1.5V(AG-13)(batteries are not included)Operating Temperature: 0℃~50℃1. Remove the protective cap.2. First clean the electrode with distilled water, and suck it with filter paper.3. Press thepower switch buttonto switch power.4. Immerse the meter electrode in solution up to the immersion level. Under no circumstances immerse above display level.5. Stir gently and wait for the reading to stabilize.6. After use, Switch off it, Use the distilled water 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 265 mV calibration solution(With quinhydronereagent 4.01 calibration solution), and stir it gently.3. Allow the reading to stabilize and with a small screwdriver turn the calibration trimmer until the display show "265".4. Rinse the electrode with distilled water and suck it with tissue paper.Note: instrument electrode required regular(about 15 days)is insertedinto the saturated solution of potassium chloride for several hours, in order to ensure the accuracy of measurement. electrode in alcohol for cleaning.If the meter can not be switched or the display fades,please check the voltage of power supply(replace the batteries when the voltage is lower then 4.5V), to replace all the batteries, pull out the battery case and replace the batteries. Pay attention to the polarity of battery.