In a factory in the Arizona desert, Andrew McLean is building bombproof watches. 
We talk a lot about tool watches here on Worn & Wound. We review dive watches with impressive water resistance, and field watches with cases that are coated with materials to keep them scratch free forever. There?s no denying that there?s a market for purpose built, durable watches that stand up to the elements, whatever those may be, and lots of brands are currently filling that niche. 
What McLean is doing, however, appears to be on another level entirely. 

His company, S?L Instruments, was founded upon a desire to make an unbreakable watch. McLean?s background as a private contractor and consultant, work filled with travel to environments that were sometimes unforgiving, instilled in him an understanding that a watch is, above all, a tool. But it?s his experience as an EMT that really drives his desire to build watches that are unbreakable, over-engineered to a profound degree.  ?Imagine a scene high in the mountains,? he tells me,  ?a high angle environment, tight quarters, multiple patients, deteriorating weather, a helicopter hovering directly over our team, various technical elements in place for both team and patient safety.  The last thing I want is to spend time worrying about my gear breaking.?

McLean, having experienced his share of cracked crystals and broken spring bars, set out to make somethi...