Add to Cart Bluelab Probe Care pH & Conductivity bluelab MSRP: Now: $23.95 Was: Everything you need to clean, hydrate and calibrate pH probes as well as clean and test conductivity (ppm/EC) probes The instrument is only as accurate as the probe is clean. Accurate readings simplify crop management and provide... MSRP: Now: $23.95 Was: Add to Cart