IP65 is probably the most misunderstood thing on our spec sheets. The 6 means dust tight, no dust gets in at all. The 5 means protected against water jets from any direction, low pressure. It does not mean submersion. You drop an IP65 torch in a bucket and leave it, it can fail.
For leak-detection guys who work under cars and in damp plant rooms, IP65 is usually plenty, they get splashed and sprayed but they are not diving. For anyone working near actual immersion you want IP67 or IP68, and that is a different o-ring and seal job, more cost.
How we actually test it, we don't have a lab worth millions, but we built a jet rig in the corner of the workshop. A 6.3mm nozzle, the standard for the 5 rating, set at the right pressure and distance, and we spray each batch sample from every angle for the required time then open it up and check for water inside. Dust side we use a chamber with fine talc.
The part that catches people out is that the rating is for a new torch with the threads done up properly. The moment the customer leaves the battery cap loose, or the o-ring gets a hair or a grain of grit on it, the seal is gone. We grease the o-rings before they ship but greases dry out and o-rings age.
Bit of a tangent, the single most common warranty claim we get isn't the LED or the driver, it's water in the battery tube because someone changed the battery with wet hands and didn't seat the cap. Not really a torch fault but we usually just replace it, arguing about it isn't worth the goodwill.
So when we put IP65 on a box I want it to mean we sprayed a sample from that batch and it stayed dry inside, not that the design once passed a test two years ago. We log the batch test, and if a customer asks Daisy will send the photos of the rig and the opened torch.
If your use is genuinely wet, tell us before you order. Sometimes the honest answer is to spend a little more on a higher seal, and sometimes it's that you don't need it and we shouldn't sell it to you. A torch that is over-sealed for a dry job is just heavier and pricier for no reason.
