1. [Streamlined Design] Ergonomic design, one-hand comfortable grip & anti slip & anti fatigue. 4. [Compensation Function] 0~42ppt salinity compensation & 0~3500m altitude compensation & 0~60℃ automatic temperature compensation (ATC), fast response and automatic calibration. 3. [Large LCD Screen] Intuitive LCD display with backlight, easy to read values of dissolved oxygen and temperature even in dark or strong light environment. 2. [Upgraded Chip] More accurate measurement & more sensitive response & more comprehensive functions. 5. [One-Click Data Record] It supports recording 99 groups of data manually, convenient to record / compare / view data with one key., Manufacturer: PokFhgur