Feature 1、Portable Design: Handheld pen and compact carrying case, easy to put in your pocket or bag and take anywhere. 2、LCD Digital Display: The instrument adopts a dot matrix LCD display, which can display the dissolved oxygen value and temperature. 3、Features: Automatic temperature compensation, quick response time, portable and easy to carry. 4、High Performance: The instrument can be divided into two parts: sensor and electronic unit. Coated oxygen electrodes are used in polarographic film sensors. 5、Multipurpose: Can be used for measurements such as aquaculture, biological response, environmental testing (lakes, streams, oceans), water and wastewater treatment, wine production. Item Type: Water Quality Tester Material: ABS Dissolved Oxygen Measurement Range: 0~20 Mg/l Temperature Range: 0~40℃ Dissolved Oxygen Error: + 0.3mg/L Temperature Error: 1℃ Residual Current: <0.15mg/L Response Time: <30s (90% Response At 20℃) Automatic Temperature Compensation Range: 0~40℃ Battery: LR44 x 4 (Battery Not Included) Weight: Approx.260g / 9.2oz Package List 1 x Water Quality Analyzer 1 x Electrode 1 x User Manual 1 x Storage Box 4 x Sandpaper 5 x Detection Powder Package 3 x Replacement Accessories