I'm using an HC-SR04 ultrasonic sensor in a gadget that is going to sit outside for an appreciable length of time. I am looking for some sort of material that is "transparent" to ultrasonic to act as a barrier against bugs, dirt, water and the environment in general. Can anyone recommend a product or material? Thanks.
Or you could try using special thin latex or rubber that is commonly sold as "something for the weekend"
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