Bluelab PENSOILPH Soil Tester pH Pen

Bluelab PENSOILPH Soil pH Pen, Digital Meter and Water Test Kit, Also Used for Coco and Rockwool with Easy Calibration for Hydroponic System and Indoor Plant Grow, Clear

Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow White

Apera Instruments AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each