GroStar GS1 pH Pen double-ended This blend has been proven

This blend has been proven to be an optimal all in one base 'bloom' horticultural fertilizer

Xtra versatile—works with most fixtures

9" electrical cord

Digital ballast features low frequency

GroStar GS1 pH Pen double-ended This blend has been provenIncludes: pH 7 & pH4 calibration solution (50ml bottle each), KCL storage solution (10ml bottle), lanyard and user manual Measures pH and temperature 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, so you dont have to discard the entire pen when the probe reaches its end of life Large 3 color backlit screen gives