If I use H0 and H2 caps, why should I upgrade to the VisiFerm RS485?

The 50% improved robustness/lifespan of the sensor is valid when using the older H0/H2 caps due to the improved electronics. The VisiFerm RS485 is backwards compatible with the H0/H2 caps. Upgrade to the H3/H4 caps to experience an 80% decrease in calibration frequency.