5 in 1 MODE: 5 in 1 PH tester, you can accurately measure TDS, EC, SALT, SG, Temp value; Clearly know the water quality to ensure the health of your family members. HIGH PRECISION: With highly sensitive probe, you can quickly read the results; wide measuring range and high resolution ensure that you can measure different kinds of liquids AUTOMATIC TEMPERATURE COMPENSATION: With ATC function, the 5 in 1 pH meter solves the inaccurate measurement problem caused by the liquid temperature change; Easy to get a reliable and stable reading EASY TO USE: After calibration, place the sensor in the solution you want to test and get the data immediately; Before another test, wash the probe thoroughly; Or you may get an inaccurate reading WIDE APPLICATION: The portable water quality tester can be carried anywhere to measure water quality such as tap water, l RO system water, aquarium, sea water, swimming pool water. OPERATION MODE: 1. Press ON/OF, open the instrument, remove the protective cap, put it in the solution to be tested, and do not immerse it above the immersion line. Then gently shake it several times in water to remove bubbles around the electrode and read the correct measurement once the value is stable. 2. Press MODE/CAL to enter different models, TDS unit is PPM or PPT, EC unit is uS or mS, salt unit is %, sea water specific gravity unit is SG 3. Press HOLD/TEMP and it will display in the upper left corner of the screen, indicating that the value has been held. Then remove the meter from the solution and read the value. Press HOLD/TEMP again to exit hold mode. 4. Press and hold HOLD/TEMP for a long time and the screen will toggle between C and F. SPECIFICATION: Optional three-point calibration: 1413uS /12.88mS /111, 8mS Temperature compensation: ATC Auto power off: 5 minutes Temperature range: 0.1-80.0 C (32.0-176 F) Temperature accuracy: +0.5C Temperature resolution: 0.1 C/F Power: 3x1.5 LR44 Size weight: 159*34*16mm(6.31*1.3*0.6in)/60g(2.1oz) Lists: 1* quality tester water