[PSUBS-MAILIST] Backup CO2 Meter

[James Frankland via Personal_Submersibles]

Hi All,

Im going to get another CO2 monitor, as a backup.  I have decent, properly
calibrated one, so i dont want to break the bank with this one.

Anyone got any ideas for a reasonably priced backup? It needs to go up to
at least 1% really.

What are other people using?
Thanks
james
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