Feature: -Provide with EC,CF and ppm scales -100% waterproof -Flashing analogue display,easy to read -No external switches or adjustment knods Specifications: Measuring range: 4-52CF / 0.4-5.2EC / 200-2600ppm(EC x 500) / 280-3640ppm(EC x 700) Resolution: 1CF / 0.1EC / 50ppm 500 / 70ppm 700 Accuracy: 4% of reading Calibration: Factory Calibrated Auto Sense:Auto On and Auto Off Working temperature: 5-50C (41-122F) Power: 31.5v AA Batteries Dimension: 4152626mm How to use: Using the stick measure nutrient conductivity involves warming the probe sensor head in the solution, followed by measuring and reading conductivity values on the stem scale indicator light. 1.Warm Sensor Head, place probe head into solution for 1-2 minutes to reach the nutrient temperature. 2.Measure Conductivity, Briefly remove stick from solution then place it back for 1-2 seconds 3.Read Conductivity Values,Remove stick from the solution and read indicator light values on stem 4.Obtain Another Reading,To take another reading,allow the stick to switch off and then repeat the above procedure. 5.Rinse the probe after use and place protective cap back on 6.Clean regular to ensure meter remains accurate. Package include: 1 * Nutra-Wand Conductivity Meter 1 * User Manual