Greg,
I assume the lens was less than a headlight restore kit at the local ACE hardware? Just kidding.
What's your experience been with the gizmo? Were you just using it for Raining/NotRaining or trying to do some degree of estimated rainfall?
Vaisala has a (expensive) sensor all-in-one that uses a little stainless steel or chrome cap that apparently 'hears' drops of rain it and estimates their size and frequency and does a raingauge function. I wish I had one to fiddle with, but wonder if this is something similar?
Dale
I use it for detecting rain onset. I have it interfaced to a Davis "ISS", which was a Temp/Hum station originally. My meteohub monitors it via an Envoy 8x as an ISS.
The Hydreon is set for 0.001" per tip which gives me a reasonable rain detection via the Davis. I considered the higher sensitivities, but figured that having the relay beat itself to death wasn't a good idea either.
The Lens was $20 (USD). I tried "Plexus" which helped, but didn't go the full nine yards with the fine grit wet sandpapers and UV coating spray. My son and I tried one of those headlight kits on his PT Cruiser, which didn't work at all. We resorted to the wet sand method and it looked a lot better, but he wound up getting new headlights.
I figured for $20, it was worth it. (actually $23 since I got the O-ring too, plus shipping of $5). Still, half the price of a new one, and the guts work fine.
The technology looks for a change in the optics caused by raindrops. This is from rainsensors.com:
Greg H.