Get the fundamentals of growing right by getting accurate, direct pH measurements in any substrate in a matter of seconds. The reinforced spear-tip allows fast, direct measurement in in soil, coco coir blends, rockwool, potting mixes and solution. The double-junction probe reduces reference contamination, extending the longevity. BNC connector is covered to prevent corrosion. Fast sensor response for quick and accurate measurements. Suitable for use with Bluelab® Combo Meter, Bluelab® Combo Meter Plus and Bluelab® Multimedia pH Meter.