Description [5-in-1 water quality meter]TDS, PH, salinity meter, EC meter and temperature measurement are integrated. TDS measurement range: 0-1000ppm, EC measurement range: 0-10000US / cm, PH measurement range: 0.01-14.00pH, salinometer measurement range: 0.00-25.00%, temperature conversion function. [Two salt meters]This product can detect the salt content of edible salt. At the same time, seawater salinity can be detected. Food salinometer measurement range: 0.00-25.00%, seawater salinometer measurement range: 10.1-200.0ppt. [Multi-purpose test]: Portable TDS meter can be carried anywhere to measure water quality such as tap water, RO system water, aquarium, seawater, pool water, etc. [Auto power off function large screen display]The automatic power off function turns off the power after 5 minutes without any operation to save power. Adopts all transparent liquid crystal (LCD), and can display the unit of 4 digits and the corresponding physical quantity. [Waterproof rating IP67]IP67 is an international waterproof and dustproof certification. Protection against dust ingress, protection against short-term immersion. 1. Multifunctional water quality tester The EZ-9909 is a new multifunctional water quality tester that can measure pH, TDS, EC, salinity, and temperature. Wide measuring range, can measure both freshwater salt and sea salt 2.With backlight function, it can be tested at night 3. Waterproof grade is IP67, no adverse effect when the shell is temporarily immersed in 1M water at normal temperature and normal pressure. 4. Wide range of applications The product can be used in swimming pools, spas, family kitchens, laboratories, farms and aquariums. 5.Use and calibration procedures and precautions Note: Be sure to clean the electrode after use Electrode is broken if solution cannot be identified by pH calibration packing list 1 * 5 per tester 1 * English manual 3 * ph buffer power Frequently Asked Questions Q: Is it turned off automatically A: The battery is 3x1.5lr44 and shuts down automatically after 5 minutes without any operation. Q: Is there automatic temperature compensation A: Yes, with ATC function Q: Why are the PPT measurements so different A: The accuracy is accurate within 150ppt, but the deviation over 160ppt is large