Features: 1. Easy to clean: The electrode protective cover can be removed for cleaning the probe and the sheath. 2. Fast measurement: Due to the high-quality sensor element, a measurement can be completed in 2–6 seconds. 3. Easy to use: The pen electrode can be directly inserted into the mouth of a drinking bottle for measurement. 4. Made of high-quality ABS plastic material, the product is sturdy, durable, and has a long service life. 5. Application scope: Testing the purity of drinking water, purified water production, boiler water, and swimming pool water. Specification: Item Type: Water Quality Tester Product Material: ABS Product Weight: Approx 56g / 2.0oz Product Size: Approx 15.3 x 3cm / 6.0 x 1.2in Battery Information: 2 x Button Batteries LR44 (Not Included) Measuring Range: 0–9990ppm Accuracy: ±2% (F.S) Automatic Temperature Compensation: 0–60°C Working Temperature: 0–50°C Application Scope: Testing the purity of drinking water, purified water production, boiler water, swimming pool water, etc. Package List: 1 x Water Quality Test Pen 1 x Manual 1 x Leather Case