The Waterproof EC/TDS Tester is an easy to use, convenient meter. Graphite electrodes ensure accuracy, and are easily replaced with a new cartridge. This tester comes with a probe, batteries and electrode replacement tool to make maintenance easy. Stainless steel temperature probe provides fast and accurate measurement. The unit automatically figures calibration and temperature compensation, but the EC/TDS conversion factor and temperature coefficient are adjustable. The dual-level LCD display shows EC and TDS as well as F. or C. Unit features a prompt telling the customer when to take a reading and also when to freeze the display. The battery lasts 100 hours, and the unit automatically shuts off after 8 minutes. Range: EC - 0 to 3999 µS/cm; TDS - 0 to 2000 ppm. Accuracy: EC ±2% full scale, TDS ±2% full scale, temp ±5° C or ±1° F. This tester combines the convenience, accuracy and quality that customers need.