Features: 1. The pen electrode can be directly inserted into the mouth of the drinking bottle for measurement, and the pen lid can also be used as a container for the liquid to be tested, which is convenient to use. 2. Fast measurement.Because of the exquisite sensor elements, a measurement can be completed in 5 seconds. 3. Automatic temperature compensation, the water quality monitor can automatically convert the indicated value to the indicated value at 25 degrees. 4. Easy to clean, the electrode protective cover can be removed for cleaning the probe and the sheath. 5. The operating temperature is 0 to 50 degrees celsius, and the detection range of total dissolved solids is 0 to 4999ppm. Specification: Item Type: Water Quality Tester Material: Plastic Product Size: Approx.16.5 x 3cm / 6.5 x 1.2in Battery Type: CR2032 Button Battery Battery Model: DC3V Battery Capacity: 230mAh (Shipped with Built in Battery) Total Dissolved Solids Detection Range: 0 to 4999ppm Test Accuracy: ±2% Temperature Detection Range: 0 to 99℃ (32 to 212℉) Use Environment: 0 to 50℃ Maximum Relative Humidity 95% Material: Plastic Uses: Suitable for Water Quality Testing in the Water Treatment Industry, Water Industry, Family, Home Travel, Field Operations, Swimming Pools, Etc. Weight: Approx.72g / 2.5oz Package List: 1 x Water Quality Tester 1 x User Manual 1 x Storage Bag Features Convenient Design: The pen electrode can be directly inserted into the mouth of the drinking bottle for measurement, and the pen lid can also be used as a container for the liquid to be tested, making it easy to use. Fast Measurement: Exquisite sensor elements enable a quick measurement completion in just 5 seconds, saving time and providing real-time results. Automatic Temperature Compensation: The water quality monitor automatically converts the indicated value to the value at 25 degrees, ensuring accurate readings in varying temperatures. Easy Maintenance: The electrode protective cover can be removed for easy cleaning of the probe and sheath, ensuring hassle-free maintenance and long-lasting use. Wide Operating Range: Operating temperature of 0 to 50 degrees Celsius and a detection range of total dissolved solids from 0 to 4999ppm, making it suitable for various environments and water types.