Nutra-Wand - Conductivity Meter The Nutra-Wand is an essential accessory to both Terraponic and Hydroponic growing techniques. The Nutra-Wand offers the precision measurement of the nutrient strength in your plant feed solution, enhancing your ability you to achieve maximum performance from your plants. Provided with EC, CF and PPM scales 100% waterproof Programmed in microprocessor Factory calibrated - No more calibration! Flashing analogue display, easy to read! No external switches or adjustment knobs Automatic On and Off Model: RS-100A Measuring Range: ?4 - 44 CF ?0.4 - 4.4 EC ?280 - 3080 ppm Resolution: 1 CF unit (0.1 EC) Accuracy: 4% Temp: 5 - 50癈 (ATC) I am the manufacturer of the YM Instrument Co.,Ltd.