I'm looking for a CO meter, not working is fine

Also a k-jet pressure tester

Sorry scrapped the last CO meter I had. Is this for display or use? If use then a modern wideband lamda sensor will do a much more accurate job at a cheaper price. There are a lot of gotcha's you have to be aware of to tune with a CO meter.

@ramrod I have one, it's not for sale but you are welcome to come and use it to do your tuning. I have a K-Jet pressure tester also.

Thank you for the generous offer, that might be the most practical idea

I use this eBay kit for my k-jet pressure testing. It comes with the right hoses and adapters:

https://www.ebay.com.au/itm/162512904004

Mind it's not the best bit of kit. I had to use generous amounts of thread sealant to stop it from leaking and the hoses tend to harden up over time, but it did the job.