GroStar GS1 pH Pen VISION Top-Max is highly effective due

Top-Max is highly effective due to its rich content of humic and fulvic acids

Change every 5

hard plastic

Use on vegetables

One pint makes up to 16 gallons

GroStar GS1 pH Pen VISION Top-Max is highly effective dueThe GroStar GS1 pH Pen from Apera Instruments was designed specifically for growers. Features: 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 you clear information IP67