Features Operating voltage : 5 ? 0.2 V Operating current : 5 - 10 mA Range of pH reading : 0 - 14 Measurable liquid temperature : 0 - 80 ?C Response time : ? 5 s Falling time : ? 60 s Power rating : ? 0.5 W Module temperature : -10 to +50 ?C Relative humidity level : ? 95% RH Module dimension : 42 x 32 x 20 mm Output type : Analog Has 4 M3 mounting holes PH Electrode probe usage and shelf maintenance When not in use, place the sensor in well-protected environment, wash the electrode with deionized water if there is contamination present on the electrode probe. For best measurement results, the electrode ball must be fully immersed into the measured liquid (or at least 2.5cm depth) so it can operate with full ionic effects. Storage instruction Immerse the electrode ball into salt solution for at least 1 hour to restore its calibration. If you do not have the salt solution as storage solution, you can use any buffer solution with pH7 neutrality, mix with 1g KCl salt as the temporary storage solution. Immerse in the provided solution for long shelf time storage. Packing Included : 1 x E201-C BNC Electrode PH Sensor probe 1 x Preamplifier Module 4 x M3 philips screws and nuts