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1. DIGITAL DISPLAY: Digital hydrogen meter adopts digital screen display with backlight design, which makes reading data more clear and convenient.
2. DATA HOLD FUNCTION: Pen type H2 meter has data hold function, easy to store and use, easy to operate, just press "HOLD" button to lock the data.
3. POWERED: Under the low voltage prompt, when the display is dim and the symbol appears at the top of the display, indicating the voltage is insufficient, please replace the new as soon as possible.
4. PORTABLE DESIGN: Water quality tester adopts handheld design, small size and light weight, does not take up space, easy to carry.
5. WIDE APPLICATION: Hydrogen tester is widely used in environmental protection, , , geological exploration, metallurgy, surface water, industrial wastewater, drinking water and other testing.

Specification:
Item Type: Digital Hydrogen Meter
Material: ABS
Product Size: Approx. 18.8cm/7.4in
Gross Weight: 245g/8.6oz
Display: H2 and Temperature Dual Display
Measuring Range: 0‑2400ppb, 0‑2.40ppm
Resolution: 2ppb, 0.2ppm
Automatic Temperature Compensation: 0‑50℃
Operating Temperature: 0‑50℃（32‑122℉)
Temperature Display Resolution: 0.1℃
Temperature Accuracy: ±0.2℃
Auto Shutdown: 10 Minutes
Low Pressure Display: Yes
℃ and °F Temperature Conversion: Yes
Data Retention: Yes
: 4 x LR44 1.5V Button Cell (Shipped Without )
Product with Backlight
Uses: Widely Used in Environmental Protection, , , Geological Exploration, Metallurgy, Surface Water, Industrial Wastewater, Drinking Water and Other Testing

How to Use:
Please pull off the electrode protection sleeve under the test pen by force before use, just pull it off directly, please dont spin it!
 I. Hydrogen content measurement 
Take out the hydrogen enrichment test pen from the box, press switch key to turn on the instrument. After the value of "0" is displayed on the screen, put the instrument into the water to be measured for testing.
II. ppb and ppm conversion 
 1. The default measurement unit of the instrument is ppb. 
 2. In the power on state, press the FUN key to convert the measurement mode between ppb and ppm. (1ppm = 1000ppb)
III. Automatic Temperature Compensation (ATC) 
ATC symbol appears in the lower left corner of the display, indicating that the instrument is in automatic temperature compensation mode.
IV. Lock function
 When the test pen is working normally, press HOLD key to lock the current data on the display, and the HOLD symbol will appear on the display, then press HOLD key to release the lock mode, the HOLD symbol disappears.  
V. Over range display
When the hydrogen enrichment measurement value is greater than 2400 ppb (2.400ppm), the display area will show the over‑range symbol: ‑ ‑ ‑.
When the temperature is below 0℃ or above 50℃, the temperature display area will show: the symbol L and the symbol H.
VI. Low voltage indication
When the display is dull and the  symbol appears in the upper part of the display, it means the  voltage is insufficient, please replace the new  as soon as possible, do not mix the old

Package List:
1 x Water Quality Testing Pen
1 x Instruction Manual
1 x Storage Box

Note:
1. The instrument is replaceable electrode structure, so in normal use, please do not unscrew the electrode fixing ring, so as not to enter the water caused by instrument failure;
2. The life span of the electrode will vary according to the frequency of use, so the electrode should be replaced when the test is not allowed;
3. This instrument is used to determine the size of hydrogen content dissolved in water generated by hydrogen rich water generator, do not use it on acidic and alkaline ionized water, iced water above 50℃, below 0℃, fruit juice, , coffee and other liquids.
4. All data are measured manually, and there are certain errors in the measurement results.
5. Do not mix old and new batteries.