Product Details: AI11030 - GroStar GS3 EC/500ppm/700ppm/Temp (4-IN-1) Pen Lab grade instruments designed specifically for growers! Includes: - 2-year warranty (instrument) - 1-year warranty (probe) - 2.77 EC calibration solution, 50 ml bottle Features: - 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