1Multi Purpose: Multifunctional tester pen can be used to detect TDS, SALT, TEMP, SG, etc., and its measuring range is wide, with high accuracy. 2Scope of Application: Multifunctional meter is very suitable for pH value detection applications in homes and laboratories, including drinking water, swimming pools,beer brewing, kombucha, aquariums, hydroponics, laboratories, food processing, etc. 3Automatic Temperature Compensation: The temperature may affect the reading level. The automatic temperature compensation function of SG tester pen can ensure that you get more accurate readings. 4Automatic Shutdown: SALT tester has automatic shutdown function, which can turn off the power after 5 minutes and save energy without any operation,and has a large LCD screen. 5Compact Portable: Temp meter is compact in structure and small in size, which is convenient to carry in a bag or pocket.1 x Multifunctional Tester Pen1 x User Manual