Potting soil -Waterproof pH meter pen Highlights generic brand Waterproof pH meter pen 2-in-1 PH meter and thermometer, very accurate for measuring range 0-14 pH, resolution 0.01pH / 0.1pH, simultaneous measurement and display of pH with LCD display, reliable and fast reading. Just remove the protective cap and immerse the pH meter electrode in the solution, then turn on the PH with the "ON/OFF" switch to measure. Easy to calibrate, just follow the instructions, immerse the pH tester in the solution and adjust with the included screwdriver. Pocket size, you can put it in your pocket wherever you go outside to do pH test. It also comes with a handy storage case and a dedicated screwdriver for calibration. Be careful with the glass probe as it can be a little fragile when in use and remember to wipe it gently with a soft, clean cloth when you're done before covering it again. Specification: Model: K13 Type: pH Meter and Thermometer (2-in-1) pH Measurement Range: 0-14.0 pH Resolution: 0.01 pH / 0.1 pH Temperature Measurement Range: 0.0-50.0 degrees Celsius (32-122 degrees Fahrenheit), 2 display modes for option Resolution: 0.1 degree Celsius / 1 degree Fahrenheit Voltage detection range: 0-828mV Resolution: 1mV Meter Calibration Latch function Spikes Low Voltage Working voltage: 3.3V Material: ABS White color Size: approx. 205x75x45mm / 8.07x2.95x1.77 inch Package includes: 1 piece of waterproof digital pH meter pen