Apera Instruments GroStar GS4 5-in-1 pH/EC/PPM/Temp Combo Pen Insect & Disease Control Featuring the very recognizable squeeze-to-open

Featuring the very recognizable squeeze-to-open pop-top closure

1/4" inline shut off

virtually eliminating material loss

will cost $1

Apera Instruments GroStar GS4 5-in-1 pH/EC/PPM/Temp Combo Pen Insect & Disease Control Featuring the very recognizable squeeze-to-openLab grade instruments designed specifically for growers! The GS4 5 in 1 Combo Pen includes: pH 7 & pH 4 calibration solution (50ml bottle each), 2. 77 EC (50ml bottle) and KCL storage solution (10ml bottle), lanyard and user manual Measures pH, 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