The IP67 Waterproof casing and replaceable probe make it suitable also for heavy-duty applications, such as wastewater treatment and agriculture. The modular design allows easy probe and battery replacement. Tester range: 0 to 1999 ppm (mg/L). Resolution: 1ppm (mg/L). Temperature Compensation: automatic fro 5 to 50-Degrees Celsius. TDS factor - 0.5. Calibration: Manual, at 1 point through trimmer. Probe: MA73075 (replaceable). Battery Type: 3 by 1-1/2-volt Alkaline. Battery Life: Approximately 250-hour of continuous use. Weight 30g, Dimensions: 165 by 30 by 30-mm. Supplied complete with protective cap, 20-Ml 1382 ppm sachet of calibration solution, hard carrying case, calibration screwdriver, batteries and instructions.