The Soil pH Pen from Bluelab is a precision handheld meter that helps growers measure soil pH and temperature directly at the root zone, ensuring optimal growing range without messy soil slurries. Designed for use in soil, coco coir, rockwool, potting mixes, or even nutrient solutions, this compact and rugged tool delivers accurate pH readings with a double-junction probe and fully temperature-compensated results. Just like the 3-in-1 OnePen and Multimedia pH Meter, the Soil pH Pen features a backlit display and integrated storage cap/dibber make it easy to take readings right where it matters most, while the two-point calibration system with a 30-day reminder keeps accuracy reliable over time. The Soil pH Pen is fully waterproof and built for everyday use, empowering cultivators of all levels with fast, dependable insights into their growing medium.