Features 1、Test the DO(dissolved oxygen) value and temperature(℃/℉) of water. 2、Pen-type intelligent dissolved oxygen analyzer, portable and easy to carry. 3、Facilitate the user to carry on-site operation to display dissolved oxygen values and temperatures. 4、Pocket size, lightweight with backlight /u0026 large LCD display for clear and easy reading. 5、Apply in soil-free growing, aquarium, swimming pools, freshwater culture, mariculture, beverage factory, wastewater treatment plant, laboratory, etc. 6、Test the DO(dissolved oxygen) value and temperature(℃/℉) of water.Pen-type intelligent dissolved oxygen analyzer, portable and easy to carry. 7、ATC function (automatic temperature compensation), fast response time and automatic calibration. 8、Test the DO(dissolved oxygen) value and temperature(℃/℉) of water. Large battery capacity, bulit-in 3.7V/1000mAh lithium battery. 9、Pocket size, lightweight with backlight /u0026 large LCD display for clear and easy reading. Pen-type intelligent dissolved oxygen analyzer, portable and easy to carry. Specification Specifications: Material: ABS Plastic Item Name: Pen Type Dissolved Oxygen Meter Display: Large LCD Display with Switchable Backlight Range: Dissolved Oxygen: 0.00 to 20.00 mg/L Temperature: 0℃ ～ 40℃ (32.0℉ ～ 104℉) Response Time: ＜ 30 seconds Resolution: Dissolved Oxygen: 0.01 mg/L Temperature: 0.1℃(0.2℉) Accuracy: Dissolved Oxygen: ±0.4 mg/L Temperature: ±1℃ Salinity Compensation: YES(ppt) Pressure Compensation: YES(mmHg/KPa) Automatic Temperature Compensation: 0℃ ～ 40℃ Working Temperature: 0℃ ～ 40℃ (32℉ ～ 104℉) Working Humidity: ≤85%RH Power: 1* 3.7V/1000mAh lithium battery Charging limited voltage: 4.2V Auto Power off: 5 Minutes without any operating Data Hold: YES Low Battery Indication: YES Temperature Unit: ℃/℉ Switchable Item Size: Approx. 140 * 43 * 43mm / 5.5 * 1.7 * 1.7in Item Weight: Approx. 132g / 4.6oz Package List 1 x Dissolved Oxygen Meter 2 x Spare Probe Protective Cover 1 x Storage Bag 1 x User Manual 1 x Electrolyte