YINMIK EC TDS Meter 4 in 1 Conductivity TDS Salinity Temperature Meter for Hydroponics, Waterproof PPM Water Tester with Backlit for Nutrients, Indoor Plants, DWC Growing System, Aquaponics, Pool

Easy to Read: The large screen display with green Backlight helps to read the EC meter reading at odd angles and in low light. Press the {HOLD/TEMP} key to lock the reading, which helps to easily record readings
Stable and Reliable Reading: The additional chip makes the reading more stable, and the automatic temperature compensation (32 to 122℉) keeps the reading consistent.
Multiple Uses: Test salinity, EC (conductivity), tds levels and temperature of nutrient solutions in hydroponics system and water reservoirs to keep your plants balance and healthy. Widely used in drinking water, filtered water, RO/DI water, home tap water, coffee, pool, aquarium, hot tub, Spas, well water, field water quality work, fish tank.
Easy to Use: Came pre-calibrated and ready to use out of the box. Turn on the EC meter, put the probe in the test liquid, the reading will be displayed on the screen. Press {MODE/CAL} key to switch readings of EC (μS/cm / mS/cm), TDS (ppm/ppt), Salt (%), Salt (ppm/ppt)
Additional Features: Water resistant: don’t worry about the EC meter falling into the water; Replaceable probe: reduce your maintenance costs