The moisture meter can quickly measure the moisture content of the grain. 1. High-quality materials: Made from high-quality ABS material, the hydrogen measuring pen is durable, long-lasting, and easy to damage. 2. Detachable Probe Design: With its detachable probe design, the hydrogen measuring pen is easy to use and simple to operate. 3. High sensitivity: Adopting sophisticated production technology, the ma hydrogen measuring probe high sensitivity and excellent performance. 4. Backlit LCD Display: The hydrogen test pen adopts backlit LCD display, which can read clearly in any dark environment. 5. Scope of application: Suitable for pool experiments, hydroponic food, aquariums, gardening, laboratories, drinking water for water purification, pond, etc. Specification: 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 Operating environment: 0 to 60 (32,0 to 140 ), relative humidity 90 Waterproof: IP67 Battery: 3 button batteries 1,5 V (LR44) (not included) Product Size: Ok. 183 x 37mm / 7.2 x 1.5 inches Display: digital LCD display with backlight Temperature: automatic temperature compensation from 0 to 60 Data storage: Value storage Automatic shutdown: 5 minutes Calibration point H2: 224 , error 20 ppb is normal Application: Suitable for pool experiments, hydroponic food, aquariums, gardening, laboratories, water purification, drinking water, pond, etc. Weight: Ok. 139g / 4,9 oz List of packages: 1 x Hydrogen Test Pen (No Battery) 1 x User Manual) Note: After use, the electrode should be cleaned 1. Remove the protective cover. 2. Press the power button to turn on the meter. 3. Dip the meter electrode into the test solution (the immersion depth must not exceed the immersion line) 4. Stir gently and wait for the reading to stabilize. 5. When finished, clean the electrode with distilled water and press the power button to turn off the meter.