" 【 3 in 1 design 】This is a multifunctional 3-in-1 PH/TDS thermometer and 3-in-1 temperature meter that can be used to measure pH, TDS and solution temperature. Temperature measurement range between -50℃ and 70℃, able to withstand harsh conditions, providing longer-lasting services. Convenient to Use: Powered by 4 button batteries (not included). The electrode probe can be replaced, with ATC function. Easy to calibrate pH and TDS with a small screwdriver. Portable Design: Hand-held pen style and compact carrying case make it convenient to put in your pocket or bag and can be taken anywhere. Fast and Accurate Reading: Large and clear LCD display with backlight, easy to read and accurate measurement functions. Widely Used: Suitable for water sources, aquarium, hydroponics, laboratory and scientific testing, spas, swimming pools and other water systems. Description: The water quality monitor is the useful tool for testing pH / TDS / TEMP of solution level. It looks like a pen, portable