Easy to Use: Simply immerse the pH meter electrode in the solution to be tested, readings are quickly display on a large lcd display Wide Application: Ideal instrument for any aquarium, the fishing industry, swimming pools, spa, school laboratories, food & beverage, drinking water etc. Auto Calibrated: Features in-built calibration with 2 buffer powders(included).Just a button to finish the calibration.This pH meter is factory calibrated. Users can use it directly. Fast and Accurate Results: No need to work with those annoying color charts and test strips.Resolution:0.01pH,Accuracy:±0.01pH Compact Portable Design: Pocket fitting pH meter that's also and compact. Total concealed fit in your bag or pocket for easy, casual carrying. Display: LCD Digital Accuracy: 0.01 Resolution:0.01 Operating Temperature:0-60°C Measuring Range:0.00-14.00 Probe Type: glass bulb electrode Power Supply:2 * 1.5V LR44 Batteries Color: A:Blue Material: ABS Package Contents: 1 * Test pen 1 * English instruction manual 1 set * accessories 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.