m&h RWP20.50 radio-wave touch probes are available in two different frequency ranges. As a technology pioneer, m&h long ago introduced the first reliably functioning probe with radio-wave transmission of the measurement signals onto the market. The industrial frequency band of 433 MHz is still used today for reliable transmission of time-critical signals. The new radio-wave touch probe is still compatible with existing equipment in the available 433 MHz version. Alternatively to this, the new m&h RWP20.50 radio-wave touch probe is also available with a new radio transmission technology in the frequency range of 2.4 - 2.4835 GHz.