Feature: Fast and Accurate Readings: Just turn it on, dip in liquid and read display,no need to work with color charts or test strips;Large LCD display makes it easy to read. ATC Function: Automatic Temperature Compensation accounts for changes in temperature automatically;Full measurement range of pH 0-14, 0.01 pH resolution. Automatic Calibration: No need any adjustment screwdrivers, just finish the calibration with Auto calibration button .(Not include buffer powders) Portable Design: Handheld pen style and compact carrying case makes it conveniently fits in your pocket or bag and goes anywhere. Wide Application: Ideal for home and laboratory pH testing applications, including drinking water, swimming pools, aquariums, hydroponics, etc. Specification: Measurement range: 0.00-14.00ph Accuracy error: ± 0.01ph Resolution: 0.01ph Working temperature: 0 ℃ - 60 ℃ Material: shell: ABS Battery: 2X1.5V (LR44 button battery) Overall dimension: 155mm X 31mm (W) X 18mm (H) Outer box size: 167mm X 52mm (W) X 30mm (H) Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement. Included: 1 X PH Test Pen 3 X PH Buffer 1 X Instruction Manual