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Hi all, the names Ian, I'm in the UK. I was hoping someone could help with this. I won it on ebay sometime ago and have decided to have a play. the CO meter seems to work as does the strobe. I think it works as a multi meter as well but will not read RPM. also the I have no idea what the symbol...

Hi all, the names Ian. I was hoping someone could help with this. I won it on ebay sometime ago and have decided to have a play. the CO meter seems to work as does the strobe. I think it works as a multi meter as well but will not read RPM. also the I have no idea what the symbol is next to...