Easy to use: Simply dip the pH meter electrode into the solution to be tested, the readings are quickly displayed on a large lcd display. Wide Application: perfect tool for any aquarium, fishing industry, swimming pools, spas, school labs, food & beverage, drinking water, etc. Auto Calibrated: Equipped with built-in calibration. Just press a button to complete the calibration. This pH meter is factory calibrated. Users can use directly. Fast and Accurate Results: No need to work with those annoying color charts and test strips. Resolution: 0.01 pH, Accuracy: +/- 0.05 pH. Compact Portable Design: Pocket pH meter fitting which is also and compact. Total recessed fit in bag or pocket for easy, casual carry. Function: pH / Temperature / Humidity / Bluetooth Compatible PH range: 0.00 ~ 14.00pH TEMPERATURE: 0.1-60.0 C; 32.0-140.0 RH: 1-99% RH TEMP: 0.1 C; 0.1 RELATIVE humidity: 1% RH TEMP: +/- 0.5 less than or equal to 2% RH Weight: about 80g Colour: green Material: plastic Size: 158x33mm Package Contents: 1 * Ph Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.