Reinforced spear-tip for fast, direct measurement in substrates  
Effective in soil, coco coir blends, rockwool, potting mixes and solution 
Double-junction probe reduces reference contamination, extending longevity 
Fast sensor response for quick and accurate measurements  
Suitable for use with the Bluelab Combo Meter, Bluelab Combo Meter Plus and Bluelab Multimedia pH Meter 
BNC connector is covered to prevent corrosion