Chances are that there isn’t one. The word ‘waterproof’ itself doesn’t mean anything. It could mean that it will survive a few drops of rain up to being hit with a high pressure water jet. Fortunately there are standards, found under International Protection Marking, a.k.a. IEC standard 60529. We know it better as IPX codes.
|IP Code||Meaning & Test Standard|
|IPX0||No special protection.|
|IPX1||Protected against falling water. Equivalent to 3-5mm rainfall per minute for a duration of 10 minutes. Unit is placed in its normal operating position.|
|IPX2||Protected against falling water when tilted up to 15 degrees – Same as IPX1 but unit is tested in 4 fixed positions – tilted 15 degrees in each direction from normal operating position.|
|IPX3||Protected against spraying water – Water spraying up to 60 degrees from vertical at 10 liters/min at a pressure of 80–100 kN/m2 for 5 min.|
|IPX4||Protected against splashing water – Same as IPX3 but water is sprayed at all angles.|
|IPX5||Protected against water jets – Water projected at all angles through a 6.3 mm nozzle at a flow rate of 12.5 liters/min at a pressure of 30 kN/m2 for 3 minutes from a distance of 3 meters.|
|IPX6||Protected against heavy seas – Water projected at all angles through a 12.5 mm nozzle at a flow rate of 100 liters/min at a pressure of 100 kN/m2 for 3 minutes from a distance of 3 meters.|
|IPX7||Protected against water immersion – Immersion for 30 minutes at a depth of 1 meter.|
|IPX8||Protected against water submersion – The equipment is suitable for continual submersion in water under conditions which are identified by the manufacturer.|
So where does a radio like the Baofeng UV-5X fit in? Nobody knows. Baofeng didn’t specify to what extent a UV-5X can survive moisture. If they want to convince us, they should give the radio one of the IPX codes mentioned above. Bottom line: if you buy one, do not expect more than IPX1, or IPX2 if you’re really lucky.
BTW, my Yaesu VX-170 and VX-177 are protected against water ingress to IPX7 specifications (immersion in one meter of water for up to 30 minutes). An unfortunate accident years ago (radio dropped into a canal) proved that Yaesu didn’t lie to me. You get what you pay for.