Dissolved oxygen (DO) is the molecular oxygen dissolved in water, which is an important index of water quality detection. This practical dissolved oxygen meter is widely applicable to aquaculture, biological reaction, environmental detection, waste water treatment, laboratory field, medical field and so on. Features: [Streamlined Design] Ergonomic design, one-hand comfortable grip andamp anti slip andamp anti fatigue. [Upgraded Chip] More accurate measurement andamp more sensitive response andamp more comprehensive functions. [Large LCD Screen] Intuitive LCD display with backlight, easy to read values of dissolved oxygen and temperature even in dark or strong light environment. [Compensation Function] 0-42ppt salinity compensation andamp 0-3500m altitude compensation andamp 0-60 automatic temperature compensation (ATC), fast response and automatic calibration. [One-Click Data Record] It supports recording 99 groups of data manually, convenient to record or compare or view data with one key. [Wide Applications] Widely applicable to aquaculture, biological reaction, environmental detection, waste water treatment, laboratory field, medical field, etc. Specifications: Model: AR8406 Material: ABS Color: Orangeandamp Grey Power Supply: 4 x AAA battery (NOT included) Dissolved Oxygen: Measuring Range: 0.0-30.0mg or L Resolution: 0.1mg or L Accuracy: andplusmn 3.0 percent Calibration: Calibration of 100 percent saturated dissolved oxygen in air Temperature: Measuring Range: -5.0-60.0 Resolution: 0.1 Accuracy: andplusmn 0.5 Temperature Unit: or Switchable Salinity Compensation: 0-42ppt Altitude Compensation: 0-3500m Automatic Temperature Compensation (ATC): 0-60 Display: 38x54mm LCD Display with Backlight Data Record: 99 records manually Auto Power off: 1 hour without any operation Probe Cable Length: About 3.5m (with probe) Item Size: Approx. 17.3x7.5x3cm or 6.81x2.95x1.18in Item Weight: Approx. 143g or 5.04oz Package Size: Approx. 31x21.3x7.5cm or 12.2x8.39x2.95in Package Weight: Approx. 1051g or 37.07oz Note: Please read the User Manual carefully before use. Packing List: 1 x Dissolved Oxygen Meter 1 x Probe Cable 1 x Spare Membrane Sleeve 1 x Screwdriver 1 x Electrolyte 1 x Syringe 1 x Sandpaper 1 x Bandage 1 x Suitcase 1 x User Manual (English)