The Exhaust Gas Pyrometer Gauge is a valuable tool by montioring the gas temp. This device can save you time, money, and trouble due to the fact that this gauge lets you keep an eye on on the gas temp and alerts you to any issues. Some of the biggest things that can wear down a diesal engine is when the exhaust gets overworked and fails. Prevent this by buying this tool that also comes with a lifetime waranty.