Ok ordered the 3 deltas, first questions,app not set up yet to use 2 Deltas on bucket for tilt grading,l see l can use 2 as weather anchors ,for larger site work ? Two How weather proof are they as l can right thru the vents. Are they coated in CorrosionX to keep water off of electronics as working in wet snowy weather is a fact of life round here .Three do they charge when switch is in off position ? Accuracy seems spot on bench testing in garage, It's snowing right now so whats the deal, good to go or Fair weather conditions only?