Model Number:smy8qotc1n Package Dimensions:21 x 8 x 5 cm Special Features:Waterproof Spec: Item Type: Hydrogen Test Pen Material: ABS H2 Range: 0 to 2400ppb, 0 to 2.400ppm Resolution: 2ppb, 0.002ppm Accuracy: 10ppb, 0.01ppm Temperature Range: 0.1 to 60.0, 32.0 to 140 Resolution: 0.1/0.1 Accuracy: 0.5 Working Environment: 0 to 60 (32.0 to 140), RH 90% Waterproof: IP67 Battery: 3 x 1.5V Button Battery (LR44) (Battery Not Included) Product Size: Approx. 183 x 37mm / 7.2 x 1.5in Display: LCD Digital Display with Backlit Temperature: Automatic Temperature Compensation 0 to 60 Data Retention: Value Retention Automatic Shutdown: 5 Minutes H2 Calibration Point: 224, an Error of 20ppb is Normal Application: Suitable for Swimming Pool Experiments, Hydroponic Foods, Aquariums, Gardening, Laboratories, Water Purification Drinking Water, Pond, Etc. Weight: Approx. 139g / 4.9oz How to Use: 1. Remove the protective cover. 2. Press the power button to turn on the meter. 3. Immerse the meter electrode in the test solution (the immersion depth cannot exceed the immersion line) 4. Stir gently and wait for the reading to stabilize. 5. After completion, wash the electrode with distilled water and press the power button to turn off the meter. packing list: 1 x Hydrogen Test Pen(Battery Not Included) 1 x User Manual Note: The electrode should be cleaned after use Scope of Application: Suitable for swimming pool experiments, hydroponic food, aquariums, gardening, laboratories, water purification drinking water, pond, etc. Backlit LCD Design: The hydrogen test pen adopts a backlit LCD design, which can read clearly in any dark environment. High Sensitivity: Adopting sophisticated production technology, the hydrogen measuring pen probe has high sensitivity and excellent performance. High Quality Materials: Made of high quality ABS material, the hydrogen measuring pen is sturdy, durable and not easily damaged. Detachable Probe Design: With a detachable probe design, the hydrogen measuring pen is easy to use and simple to operate. Scope of Application Backlit LCD Design High Sensitivity High Quality Materials Detachable Probe Design