New OAKTON ECOTestr TDS Low pocket meter features a large ergonomically designed display so that you can easily view measurements at a glance. The stainless steel electrodes are both rugged and chemical resistant, for use in a variety of applications. Other features include ATC (Automatic Temperature Compensation), Hold Function, it is completely waterproof, and has a transparent plastic cap that can be used as a container for calibration or measurement purposes. Range: 0-1990 ppm. Resolution: 10 ppm. Accuracy: 1% Full Scale. Conversion Factor: 0.4 to 1. Instructions