Easy to use giving fast, accurate and repeatable measurement of pH values from pH 0-14. It has the unique feature of a retractable electrode. The LCD display has large digits making it easy to read the measured values. The protective cap facilitates the ability to put in a small sponge to keep the electrode moist, which will prolong its life. Supplied with electrode, protective cap, calibration screwdriver, 50ml calibration solution, carry case and PP3 9V battery. Resolution 0.01pH. Features automatic temperature compensation, for precise measurements at different temperatures.