Substrate probes

What soil probes are compatible with the Grow Sensor?Which sensors should I purchase?What do the substrate probes measure?Can I change my substrate type in the Grow App?*To do* How do I use the Grow soil probe adapter cable and connect my sensor?How many substrate probes can I use with the Grow Sensor?How do I position my soil probe for my pot size?My VWC reading is too low or high, help!*To do* How do I crop steer?