Feature: 1. WIDE COPE OF APPLICATION The digital water quality tester is widely used to measure PH/EC, which is very convenient. 2. EASY TO READ The multi function tester has a clear LCD with backlight, which can be monitored online for a long time. 3. USING RANGE Suitable for water sources, aquariums, hydroponics, laboratories, spas, swimming pools and other water systems. 4. EASY TO USE The PH/EC tester can detect water quality for a long time and provide instant visualization of the results. 5. RUGGED AND DURABLE Made of high quality ABS material, not easy to damage, long service life, and can be used for a long time with confidence. Specification: Item Type: Water Quality Tester Material: ABS Weight: Approx. 621g / 21.9oz Product Size: Approx. 152x80x26mm / 6.0x3.1x1.0in Scope: PH: 0.00~14.00pH Relative Humidity: 10%RH~99%RH EC: 0.00~19.99EC Resolution: pH: 0.01pH Relative Humidity: 1%RH EC: 0.01EC Accuracy: PH: ±0.1pH Relative Humidity: 5%RH EC: ±2%F.S Power Supply: DC 6V (available power adapter) Battery: Ni-MH battery 110MAH (delivered with built in battery) Temperature Compensation: 0℃~50℃. Package List: 1 x Water Quality Tester1 x Probe1 x Adapter1 x Connection Line1 x Manual 4 x Accessories Note: 1. The battery needs to be charged if the backlight becomes dim, the test error is too large, or the display is blurred.2. The device has a smart charging system, when the battery is full, it will automatically cut off.3. The recommended charging time is 2‑3 hours.4. If you use it for a long time, please connect the power adapter.