Want to know whether the dissolved oxygen value of water is up to the standard? If so, this pen-type dissolved oxygen meter is what you need. Designed and made with imported components and sensor with high sensitivity and accuracy. Dissolved Oxygen Meter is widely applied in industry, electrical and agriculture, medicine, food industry, quality of drinking water, etc. Features: Test the DO(dissolved oxygen) value and temperature(/) of water. Large battery capacity, bulit-in 3.7V/1000mAh lithium battery. Pen-type intelligent dissolved oxygen analyzer, portable and easy to carry. Facilitate the user to carry on-site operation to display dissolved oxygen values and temperatures. Pocket size, lightweight with backlight & large LCD display for clear and easy reading. ATC function (automatic temperature compensation), fast response time and automatic calibration. Apply in soil-free growing, aquarium, swimming pools, freshwater culture, mariculture, beverage factory, wastewater treatment plant, laboratory, etc. NOTE: reagentNa2SO3and CoCl2are NOT included! Customers can buy the reagent by themselves. 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/1000mAhlithium battery Charging limited voltage: 4.2V Auto Power off: 5 Minutes without any operation 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 Size: Approx. 24.5 * 9 * 5.3cm / 9.6 * 3.5 * 2.1in Package Weight: Approx. 250g / 8.8oz Package List: 1 * Dissolved Oxygen Meter 3 * Spare Probe Protective Cover 1 * Storage Bag 1 * User Manual 1* Electrolyte