AI11030 - GroStar GS3 EC/PPM/Temp PenLab grade instruments designed specifically for growers!Includes: "¢ 2-year warranty (instrument)"¢ 1-year warranty (probe)"¢ 2.77 EC calibration solution, 50 ml bottleFeatures:"¢ Measures conductivity EC, PPM (500), PPM (700) and temperature"¢ Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance"¢ Titanium alloy sensor designed for high accuracy EC measurement"¢ Easy-to-use design and fast calibration adjustment."¢ Large 3-color backlit screen gives you clear information"¢ IP67 waterproof rating "¢ Replaceable probe"¢ Powered by AAA batteries with auto off function"¢ Automatic temperature compensation