This video from Motorola explains the IP and JIS Ratings on two way radios for dust and water protection and what they mean. Understanding what these ratings are and what they mean are important when choosing a two way radio based on its resistance to environmental factors such as dust and water.
The following resources provide more in-depth information on IP and JIS ratings:
The IP and JIS Specification for Water/Dust Resistance
The Two Way Radio Show TWRS-32 - JIS and IP Specifications
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