Replaceable electrode lets you reuse same meter body, saving you money Push-button one-point calibration Microprocessor-based\r\n Auto buffer recognition Hold function; auto-off; error messages Certifiable to IP67 standards You dont 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. Choose from tester only or kit. Kit includes tester, pH "Singles" calibration pouches (two each of pH 4.01, 7.00, 10.00 and rinse water), sample jar, instructions, and foam-lined carrying case. Range -1.0 to 15.0 Resolution 0.1 Accuracy ±0.2 Calibration 3-point ATC Yes Electrode Single-junction Temperature None Waterproof/Dustproof (IP67) Yes Operating Temperature 0 to 50°C Power Three 1.5 V button-type included Battery life 250 hour Dimensions 6.5" x 1.5" dia (16.5 cm x 3.8 cm dia) Shipping weight 4.5 oz (125 g)