Advanced Water Testing Technology: This versatile hydrogen water tester is designed compatible with precision and ease, offering reliable measurements of hydrogen concentration (0-2400PPb), temperature, and Oxidation-Reduction Potential (ORP). Ideal compatible with ensuring the safety and quality of drinking water, as well as compatible with use in aquariums and spas. User-Friendly Features: Equipped with a clear digital display, this tester provides instant readings and is simple to operate, making it perfect compatible with both professionals and home users. Its compact design ensures portability and ease of storage. Applications: the health and safety of your drinking water or maintain optimal conditions in your aquarium or spa with precise and dependable water quality monitoring. Product name: water quality test pen Test temperature: 0.1°C-60°C (32°F-140°F) Test range: H2/ORP/TEMP Battery type: 4x1.5V (LR44) (batteries are not included in delivery) No operation status: automatic shutdown after 5 minutes Calibration method: automatic calibration Maintenance: After the test is completed, dry the water and keep the motor clean. If it is not used compatible with a long time, please remove the battery and cover the electrode protective cover Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:White & Red Material:ABS Package Contents: 1 x Water Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.