For parts or repair.

Bought this second hand and never used it successfully. It powers up but doesn't seem to respond to controls .  The numbers bounce around .

This professional digital exhaust CO gas and engine analyser from Gunson's is an essential tool for any garage equipment and tools collection. With its precise emission testing capabilities, it is perfect for diagnosing and troubleshooting issues related to your vehicle's exhaust system. The brand name Gunson's is synonymous with quality and reliability, making this CO emissions tester a top choice for professionals and DIY enthusiasts alike. Its manufacturer part number 4121 ensures that you are getting the latest and greatest in emissions testing technology.

The tester is specifically designed for use with vehicles and engines, making it a versatile addition to any diagnostic equipment and tools collection. Its easy-to-use interface and advanced features make it simple to conduct emissions tests and analyse the results. This Gunson's Gastester Professional Digital Exhaust CO Gas and Engine Analyser is a must-have for anyone who wants to keep their vehicle running smoothly and efficiently.