Add to Cart GroStar GS2 Soil pH Pen MSRP: Now: $256.99 Was: GroStar GS2 Soil pH Pen Lab grade instruments designed specifically for growers! Includes: pH 7 & pH 4 solution (50ml bottles of each), KCL soaking solution (10ml bottle), cleaning brush, hole dibber, lanyard and user... MSRP: Now: $256.99 Was: Add to Cart