Replaceable electrode lets you reuse same meter body, saving you money Push-button one-point calibration Microprocessor-based Auto buffer recognition Hold function; auto-off; error messages Certifiable to IP67 standards You don't need to worry if you drop the waterproof OAKTON pHTestr 1 in a tank or pond” it floats! The pHTestr 1 can also be certified to meet IP67 ratings for dustproof and waterproof ingress protection. The Waterproof pHTestr 1 is the perfect tool for quick, routine pH testing without ATC. The replaceable electrode lets you reuse the Testr body many times over and saves you money. Range -1.0 to 15.0 pH Resolution 0.1 pH Accuracy ±0.2 pH Calibration One point at 4.0, 7.0 or 10.0 Electrode Replaceable single junction Waterproof/Dustproof (IP67) Yes Operating Temperature 0 to 50°C (32 to 122°F) Power Three 1.5 V batteries Battery life 24 hours continuous use Dimensions 6.5" x 1.5" dia (16.5 cm x 3.8 cm dia) Shipping weight 4.5 oz (125 g)