Profile: Stewarts-USA manufactures pressure and temperature instrumentation, valves, manifolds & accessories. Our products are manufactured to meet the CE marking requirements of P.E.R.1999 (S2001) and P.E.D. 97/23/EC together with our ISO 9001 approval. Our safety zone reflective glow gauge with easy-view operating range markers is designed to allow anyone viewing the pressure gauge the ability to easily determine & judge if operating conditions have become abnormal.