4In1 PH/TDS/EC/Temperature Digital Meter Pen Water Quality Analysis Tester Features: Multifunctional water quality tester, which can test PH, EC, TDS, and temperature of the water. Fast to get the testing result and can test the PH value for any 0-14PH liquid which you wanna test. Adopts the digital screen display with backlight, which is more clear and convenient to read data. Compact pen-shape design, lightweight, you can test water anywhere to get the purest water. Use to measure the PH EC TDS TEMP of solution. Large LCD screen to display the result, easy to read with high precision. Apply in water sources, aquarium, hydroponics, spas, swimming pools, and other water systems. Measurement range: TDS: 1-9999ppm EC: 1-19999uS / cm PH: 0.00-14.00pH TEMP: 0-60 ? / 32-140 ? Auto-off: After 8 minutes Specifications: Item Name: Water Quality Tester 4 in 1, Easy to Read, Portable Material: ABS Auto Power-off: 8min Battery: 4 x 1.5V AG13 Battery Size: 18.3cm x 3.7cm /7.2" x 1.5"(Approx.) Package includes: 1x 4In1 PH/TDS/EC/Temperature Meter Note: The water quality detector requires pH meter calibration solution or powder calibration, this product does not contain pH meter calibration solution or powder.