AutoAqua Titanium S3 TDS MeterTitanium S3 with three probes is designed to monitor the water quality of RO/DI systems. It uses titanium probe, which performs excellent corrosion resistance. Magnetically-coupled controller makes it easy to install anywhere on a metal frame. With a ¼” Push Connect Union Tee (included in the package), it is easy to connect with RO/DI systems. Also, it is calibratable for accurate result. After 3 minutes of non-use, it will turn off automatically to conserve battery life.Features: Simple installation with a ¼” Push Connect Union Tee included High quality titanium probe Small & compact design Auto-off function Can be Calibrated Magnetic Mount Low battery indicator Specifications: Range : 0-999 ppm Resolution : 1 ppm Accuracy : +a/- 2 % Power Source : CR2032 Lithium Battery x1 Battery Life : 1 year