I've owned and exclusively use my CoilMaster 521 Tab for over a year. I've checked resistance and tidied up dozens of builds with it flawlessly. I love it! I use a Vape Nut (approx
1-3/4" dia. X 1-1/8" solid heavy block of steel with a silicone non slip base) to build on. (What I really want is a custom Tenderfoot Stand in the bowl design to catch snipped wires but he's only on Facebook and I refuse to allow Facebook to invade my privacy and sell my information to whoever they wish). Tenderfoot Stands offers the nipple style like Mike Vapes has, but he also makes a bowl version that looks much more useful to me. I'd love to find an email address for Tenderfoot Stands.
Can't go wrong with the CoilMaster 521 Tab.. It's great!