I bought a Laser 5112 Diesel Smoke Tester! Was it such a good idea? Contains advertising content

So I bought a smoke tester. I thought it might be a useful diagnostic tool but was it?
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View it on the Laser site here: www.lasertools.co.uk/Product/...
Check out the .gov.uk MoT pages here: www.gov.uk/getting-an-mot/the...
Or have a look at the MoT Testers manual here: www.gov.uk/government/collect...