I'm an HVAC technician and I use this on residential and commercial evaporator coils. This product works pretty well and seems to be durable but the biggest problem is that there is nothing to hold the comb head in place so it slips when you try to use it. Definitely not for everyday use but if you need it for a project it's amazing, especially for the price. Project Tip: Use tape to hold the bracket in place, but honestly we don't have to.