Pen design 0-19990ppm Tester Water Quality Analyser TDS PH Meter 0.01 temperature 3 in 1 Purity for Swimming Pools Laboratory The water quality monitor is professional and useful tool for testing PH/TDS/TEMP of solution level. Suitable for aquarium pool and environment water.
Features:
Use to measure the PH & TDS & TEMP of solution.
Electrode probe can be replaced， ATC function.
Easy calibration of pH and TDS with just a mini-screwdriver.
Large and clear LCD with backlight， easy to read and accurately measuring functions.
Apply in water sources， aquarium， hydroponics， spas， swimming pools and other water systems.
Automatic temperature compensation.

Specifications:
Range: pH: 0.00 ~ 14.00pH
     TDS: 0.00 ~ 19990ppm
     Temperature: -50°C~ 70°C (-58°F~ 158°F)
Resolution: pH: 0.01pH
        TDS: 10ppm
        Temperature: 0.1°C (0.2°F)
Accuracy: pH: ±0.1pH
       TDS:±2%F.S
       Temperature: ±1°C (±2°F)
Temperature Compensation: 0°C ~ 50°C (32°F ~ 122°F)
Working temperature: 0°C ~ 50°C (32°F ~ 122°F)
Power Supply: DC 6V (Power Adapter Usable)
Battery: 4×1.5V AG-13 Button Cell Batteries (NOT Included)
Item Size: Approx. 188 * 35 * 35mm / 7.4 * 1.6 * 1.6in
Item Weight: Approx. 80g

For this PH TESTER， it does not includes calibration liquid，the one you get maybe not accurate，In order to ensure the accuracy of this item pls make calibration when you get the parcel

note: this item comes without retail box