Feature: 1. High Quality Material: Dissolved oxygen meter is made of ABS material, which is sturdy and durable to ensure a long service life. 2. Dot Matrix Liquid Crystal: The instrument adopts dot matrix liquid crystal display, which can display the dissolved oxygen value and temperature. 3. 2 Parts: The instrument is divided into two parts: the sensor and the electronic unit. The sensor uses a polarographic film coated dissolved oxygen electrode. 4. Portability: This digital dissolved meter adopts a compact pen shaped design, which is light and portable and easy to carry. 5. Application: Widely used in drinking water monitoring, water regulation, reverse osmosis, wastewater, agriculture, aquaculture and beauty industries. Specification: Item Type: Dissolved Oxygen Analyzer Model: JPB-70A Material: ABS Battery: 1.5V 4 x LR44(Not Included) Support Language: English Basic Parameters: Measuring Range: Do: (0~20) mg/L Temperature: (0~40) Degrees Celsius Accuracy: Do: +0.3mg/L Temperature: 1 Degree Celsius Uses: Widely Used in Drinking Water Monitoring, Water Regulation, Reverse Osmosis, Cooling Towers, Wastewater, Laboratories, Agriculture, Aquaculture and Aquariums, Hydroponics and Printing Industry, and Beauty Industry.. Package List: 1 x Instrument 1 x Electrode3 x Electrode Cap5 x Detection Powder1 x Bottle1 x Manual 1 x Tool Box Note: If the filling fluid in the electrode overflows, wipe the overflowing filling fluid dry.