(Pre-Subcategory creation) Deals/Sales/Coupons/Pricing

[TEWphotography]

How to Use an Open/Closed Sensor as a Leak Detector

Sorry if there is already a thread dedicated to this concept and I just missed it. When I saw this in the Deals thread, and wanted to discuss it more, I decided to yank it out of there and start a thread of its own…So, Continuing the discussion from Current device deals & best prices: