The UEI TEST INSTRUMENTS Combustion Analyzer Probes are designed for use with combustion analyzers to measure oxygen, carbon monoxide, and other gases during combustion analysis. They feature a 12" stainless steel shaft and a quick connect fitting. The probes come in a variety of tip styles like straight, angled, and tapered to allow access to different areas of boilers, furnaces, and combustion chambers. The probes can withstand temperatures up to 1400°F intermittently.