Description Lutron PWA-301 is a conductivity meter (pure water meter) – Pen type. Application : Water conditioning. aquarium, food processing, photography, school, laboratory, industrial and quality control. Measurement range : 0 to 1,999 µS. Pen type, meter with probe, all in 1, easy operation. Carbon rod electrode for long life. Build in temperature sensor, ATC ( auto temperature compensation ). IP67, water proof and protection. Data hold function for freezing the desired value. Auto power off to save the battery life. Records max. and min. value with recall. Microcomputer circuit, intelligent function, high accuracy. Compact size, light weight. Power supply by DC 1.5 V battery ( UM4/AAA ) x 4 PCs Accuracy ± (3 % F.S. 1 d) Temperature Compensation: Automatic, 0 to 50 °C (32 to 122 °F). Power Supply DC 1.5V battery ( UM-4/AAA ) x 4 PCs. Power Consumption Approx. 5.7 mA. Dimension 190 x 40 x 40 mm ( 7.5 x 1.6 x 1.6 inch ). Weight 171 g/0.38 LB.