Feature:-Provide EC,CF and ppm scales100% waterproof-Flashing analog display, easy to read-No external switches or adjustment knobsSpecifications:Measuring range: 4-52CF/0.4-5.2EC/200-2600ppm(ECx500)/280-3460ppm(ECx700)Resolution: 1CF/0.1EC/50ppm 500/70ppm 700Accuracy: ± 4% of readingCalibration: factory calibratedAuto Sense: auto on and auto offOperating temperature: 5-50°c (41-122°f)Power: 3 × 1.5v AA batteriesDimension: 415 × 26 × 26mm Usage: Using a stick to measure the conductivity of nutrients involves warming the thermometer head in solution, and then measuring and reading the conductivity values on the native scale indicator light.1. Warm the sensor head, put the probe head into the solution for 1-2 minutes to reach the nutrient temperature.2. Measure the conductivity, briefly remove the stick from the solution, and then place it back on for 1-2 seconds3. Read the conductivity values, remove the stick from the solution and read the indicator values on the mandrel4. Get another reading to take another reading, let the stick turn off, and then repeat the above procedure.5. Rinse the probe after use and reattach the protective cover6. Clean regularly to keep the meter accurate. Package Included:1 * nutra-WAND Conductivity Meter1 * User Manual