Product advantages:Salinity Range: 0~9999ppm/10~200ppt or 0.0-25%, salinity tester has an automatic temperature compensation function(32F~140F), which can decrease the error caused by the change of liquid temperature.Wide applications: There are various purposes for the salinity tester. This instrument can not only detect the salt content of edible salt, salt water pool and koi fish pond, but also the salinity of seawater, marine, salt water fish tank salt level testing.Backlit design: There is no need to worry about seeing the displayed value if the light is insufficient. salinity meter features a green backlit LCD to help you see the measurement results clearly in any situation. Features:Multifunctional, can measure pH, TDS,EC, and salinity values. The measurement range is large and wide, which can measure both fresh water salinity and sea saltlow power consumption,Automatic shutdown,The instrument will shut down automatically for 5 minutes without any operation3,Automatic temperature compensation function With backlight function, it can be tested at nightSmall size, light weight, easy to carry, can be put into a pocketThe waterproof grade is IPat normal temperature and pressure, when the shell is temporarily immersed in 1M water will not cause harmful effects.Packing List: 1 x 4-in-1 Soil Survey Instrumen With Box1*Instruction Manual