No, it is not waterproof and please keep it away from water. 

You will see data from the outside sensor on your console. Look for rain, wind speed, wind direction, UV strength, temperature etc 

The display console unit can run on batteries only. However, without the a/c power cable, the display only stays on for seven seconds, and to get the display to come on, one has to press a button on the display console. Also, when running on batteries only, the unit will not maintain a wifi connection, so it won't reliably upload weather data to WeatherUnderground or other weather networks. 

I've never used Hoya ND's, but I have GOBE, KERNEL, ZOMEI, and K&F ND filters. Out of all of them, I like the K&F the most because the colors look great out of the camera and they don't create a vignette around the edges like some of my other nd's which I hate. Because of the great out of camera colors, it gives you more to work with on post-production when you shoot on a flat profile. Also, I've used them during night photography on bulb mode to do light painting and the 4 - 6 stop ones work great for this. Overall, I think for the money the K&F filters are worth it. Awesome product! 

FD-EOS This adapter ring is suitable for Canon FD mount lens and Canon EOS camera body . your canon t6 is EOS EF mount camera body, so if your lens is canon FD mount lens, the adapter is suitable for you