GroStar GS4 pH EC 500ppm 700ppm Temp (5 in 1) Combo Pen controllers Industrial Facilities & Warehouses – Industrial Facilities & Warehouses – Reduces airborne contaminants Please note that this model does not have wattage output control (dimming) and is not PX1 compatible so you don’t have to discard the entire pen when the probe reaches its end of life• Large 3 color backlit screen gives you clear information• Durable structure conductivity (EC and 500ppm 700ppm) and temperature (5 in 1)• Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance• Easy to use design and fast calibration adjustment• Double junction replaceable probe