The JPB-70A type pen type intelligent dissolved oxygen analyzer (hereinafter referred to as the instrument) is designed to facilitate the user to carry the operation on the spot. The instrument can be divided into two parts, the sensor and the electronic unit. The polarographic film coated oxygen electrode was used in the sensor. The electronic unit is composed of high integrated circuits. The instrument can display the value of dissolved oxygen and temperature by using a lattice liquid crystal display. Features: Dissolved Oxygen Meters: Oxygen meter comes with electrolyte, you can test water DO(dissolved oxygen) and temperature(/) Facilitate the user to carry on-site operation to display dissolved oxygen values and temperatures. Temperature Compensation: DO meter enjoys less than 30 seconds fast testing, 0 - 40 ATC Function(automatic temperature compensation), and automatic calibration. Easy to Operate: Freshwater aquarium test kit, portable and lightweight, is convenient to carry around and test on-site. A large LCD display with backlight allows you to clearly read data. Test to Get The Purest Water: Compact pen-shape design, lightweight for mobility, you can test water anywhere to get the purest water. Wide Application: Soil-free growing, aquarium, swimming pools, freshwater culture, mariculture, beverage factory, wastewater treatment plant, laboratory, and etc. Specifications: Model: JPB-70A Material: ABS Measuring Range: Dissolved Oxygen: (0~20.0)mg/L Temperature: 0°C~40°C Basic Error: Dissolved Oxygen: ±0.3mg/L Temperature: ±1°C Residual Current: ≤ 0.15mg/L Response Time: ≤30s (90% response at 20°C) Automatic Temperature Compensation Range: 0°C40°C Power: 4 x 1.5V LR44 Button Battery Item Size: 185 * 40mm / 7.28 * 1.57in Item Weight: 88g / 3.10oz Package Weight: 640g / 22.57oz Package Size: 30 * 22 * 11cm / 11.81 * 8.66 * 4.33in Package List: 1 * Dissolved Oxygen Meter 1 * Electrode 3 * Probe Cover 1 * A Reagent (5 packages) 1 * Empty Bottle for Spare 1 * Oxygen-Free Water 4 * Button Cell 1 * User Manual (English)