Features Completely Waterproof: The battery compartment is sealed against accidental splashes or brief immersion under one meter of water or plant food. The baton nutrition meter is fully temperature compensated for use in a variety of environments. Versatile Needs: Measure EC (conductivity), CF (conductivity) and PPM (parts per million) scales. The water quality tester has three scales to meet your diverse needs. Applicable to: The water tester is suitable for high conductivity measurement of various crops. Quickly monitor precise up and down adjustments of nutrient in solution (TDS) levels to maximize growth and ensure plants get the balanced feed they need; take action when mixing nutrients in your tank. Ease of Use: No external knobs or switches. The automatic switch function activates the baton when the solution is put in or taken out. Simple and easy to read results, the flashing LED light scale gives you all the information you need. Factory Calibration: Tester accurate readings The baton is factory calibrated every time (further calibration can easily be done periodically with EC 1.4 buffer solution to maintain accuracy) Description: If you use hydroponics to grow your own fruit and vegetables then you'll know how important it is to get the mix of the nutrients that you feed them just right. This truncheon nutrient meter is so quick and easy to use and will give you accurate results time after time. All readings are displayed on the meter-no need to consult books or manuals. Just dip into your solution and read. The proper combination of nutrients = top quality fruit and veg! Reads: EC (electrical conductivity) CF (conductivity factor) PPM (parts per million) How Do I Use My Truncheon? 1. Place the head of the probe into the solution for 1-2 minutes so that the temperature of the probe and the liquid are the same. Remove probe. 2. Place the probe back into the solution. The LED lights will indicate the nutrient levels 3. Rinse probe and replace cover. That's it! Specifications: Range 0.4-5.2EC; 4-52CF; 280-3640ppm(EC * 700) 200-3000ppm;(EC * 500) Resolution EC:0.1; 1CF; 70ppm; 700 50ppm; 500 Accuracy±4% Operating Temperature:0℃-50° C; (32-122 ℉ ) Automatic Temperature Compensation:0℃-50℃ Battery:3*AA battery(Not included) Size:415*25*25mm/16.3*1*1in Weight:103g/3.6oz Package List: 1*Nutrition Wand 1*Manual 1*Plastic Box Note: Because there was a manual measuring ,the size may has 1-2cm/inch difference. Package List