AMETEK U.S. Gauge offers a wide variety of welding and compressed gas gauges used on various types of regulators. The high pressure gauges are used for measuring cylinder or tank pressure. The low pressure gauges are used on the downstream side of the regulator to indicate regulated, reduced pressure. The low pressure gauges (15‑1000 psi) are UL 252A recognized. High pressure gauges (1500‑5000 psi) are UL 404 listed. Cleanliness for all gauges is in accordance with Level IV of ASME B40.100‑2005. U.S. Gauge compressed gas gauges are available in 1‑1/2", 50mm, 2", and 2‑1/2" sizes with polished brass or gold painted steel standard.