amtra Digital pH Tester is an electronic pH meter that allows the rapid and precise determination of the pH of your aquarium water. Practical pen shape to be carried and used anywhere. Possibility of automatic recalibration and temperature compensation are among the main advantages of this device suitable for both beginners and expert aquarists.amtra Digital pH Tester+ practical digital tester for measuring the pH of water with automatic temperature compensation (ATC)+ possibility of simple re-calibration+ auto power off after a few minutes of inactivity+ hard plastic case included to be able to store it carefully+ measurement scale 0.00 - 14.00 pH +/- 0.01pH+ automatic temperature compensation ATC (0 - 50C)Instructions for Use amtra Digital pH Tester:Remove the protective cover of the electrode. Rinse the electrode with osmotic water and gently dry it with absorbent paper. Press ON/OFF to turn it on and insert the electrode into the solution to be tested. Move it gently in the wate