Digital Display with Backlight: The digital display features a backlight for easy reading in lighting conditions, ensuring accurate readings anytime, anywhere. Wide Range of Applications: Ideal for a variety of applications including pool maintenance, hydroponics, and aquaculture, this meter ensures reliable data for informed decision-making. High Measurement: Achieve accurate water quality analysis with a range of 0.0-20.0 mg/L, essential for maintaining optimal conditions in pools, hydroponics, and aquaculture. User-Friendly Design: Designed with user convenience in mind, this DO tester is easy to operate, making it suitable for both beginners and experienced users. DO Tester Specifications: 1. Type: Dissolved Oxygen Analyzer 2.Measuring range: Oxygen concentration: DO:0-199.9% ; 0-20mg/L Temperature:0°C-50C°(32°F-122°F) 3. Resolution: Oxygen concentration (mg/L): 0.01 mg/L Dissolved oxygen saturation (%): 0.1% Temperature: 0.1°C(0.2°F) 4. : DO : ±3% °F. S. Temperature: ±1.0℃ 5. Temperature compensation : 0-50℃ 6. Battery : 4*1. 5V -13 (not included) 7. Auto Shutdown:30 min Color: Black Material: plastic Package Contents: 1* Dissolved Oxygen Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.