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 & anti slip & anti fatigue. [Upgraded Chip] More accurate measurement & more sensitive response & 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 & 0~3500m altitude compensation & 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 / compare / 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: Orange&Grey Power Supply: 4 * AAA battery (NOT included) Dissolved Oxygen: Measuring Range: 0.0~30.0mg/L Resolution: 0.1mg/L Accuracy: ±3.0% Calibration: Calibration of 100% saturated dissolved oxygen in air Temperature: Measuring Range: -5.0℃~60.0℃ Resolution: 0.1℃ Accuracy: ±0.5℃ Temperature Unit: ℃/℉ Switchable Salinity Compensation: 0~42ppt Altitude Compensation: 0~3500m Automatic Temperature Compensation (ATC): 0~60℃ Display: 38*54mm 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. 17.3*7.5*3cm / 6.81*2.95*1.18in Item Weight: Approx. 143g / 5.04oz Package Size: Approx. 31*21.3*7.5cm / 12.2*8.39*2.95in Package Weight: Approx. 1051g / 37.07oz Note: Please read the User Manual carefully before use. Packing List: 1 * Dissolved Oxygen Meter 1 * Probe Cable 1 * Spare Membrane Sleeve 1 * Screwdriver 1 * Electrolyte 1 * Syringe 1 * Sandpaper 1 * Bandage 1 * Suitcase 1 * User Manual (English)