Resolution: .001″ (range<10"), .01" (range?10"). Repeatability: .001" (range<4"), .004" (range 4~10"), .01" (range?10"). Velocity .039-.394"/_s. Measure the thickness from one side of object, suitable for pipe, tank, etc. Applicable material: metal, plastic, glass, nylon, resin, ceramic, rubber, ice. Memory of maximum 5000 readings with location number Low and high limits with judgement.

3M 89421, Ultimate FX Full Facepiece Reusable Respirator FF-402 Medium, 7000002284, 4 EA/Case
3M 21565, Half Facepiece Disposable Respirator Assembly 5101, Organic Vapor, Small, 7000126024, 12 EA/Case 