When ultrasound is transmitted through media, the voltage sensitivity will be attenuated due to different media. It is better choosing a transducer with a maximum sensing range that is at least 20% - 30% longer than the expected maximum measurement distance. Unictron's proximity measurement transducers operate at a frequency from 50 kHz to 300 kHz, with a maximum detection distance of 60 cm to 10 meters with a blind zone of 3 cm to 30 cm. Users can choose the most suitable transducer according to their needs.