Specification<br> Item Type: Hydrogen Test Pen<br> Material: ABS<br> H2 Range: 0 to 2400ppb, 0 to 2.400ppm<br> Resolution: 2ppb, 0.002ppm<br> Accuracy: 10ppb, 0.01ppm<br> Temperature Range: 0.1 to 60.0, 32.0 to 140<br> Resolution: 0.1/0.1<br> Accuracy: 0.5<br> Working Environment: 0 to 60 (32.0 to 140), RH 90%<br> Waterproof: IP67<br> Battery: 3 x 1.5V Button Battery (LR44) (Battery Not Included)<br> Product Size: Approx. 183 x 37mm / 7.2 x 1.5in<br> Display: LCD Digital Display with Backlit<br> Temperature: Automatic Temperature Compensation 0 to 60<br> Data Retention: Value Retention<br> Automatic Shutdown: 5 Minutes<br> H2 Calibration Point: 224, an Error of 20ppb is Normal<br> Application: Suitable for Swimming Pool Experiments, Hydroponic Foods, Aquariums, Gardening, Laboratories, Water Purification Drinking Water, Pond, Etc.<br> Weight: Approx. 139g / 4.9oz<br> Package List<br> 1 x Hydrogen Test Pen (Battery Not Included)<br> <br> 1 x User Manual