High resolution portable o2 meter

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We are in the market for another 02 meter that needs to be fairly portable and have a resolution to 10 ppm. We currently have a MODEL C5E ANALYZER Handheld Digital Oxygen Analyzer  by Nuetronics INC but it is unserviceable now. We also have one of their products that plugs in and goes down to 1ppm, ($2500 from what I remember) but we only need one of those.  So I'm wondering if anyone has recommendations about a new portable one. One that I did not like about the C5E is that the internal modules had expiration dates on them so we had to buy them yearly to keep it up to spec.  Thanks for any input on this.Common sense in an uncommon degree is what the world calls wisdom.
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Originally Posted by Brainfarth

We are in the market for another 02 meter that needs to be fairly portable and have a resolution to 10 ppm. We currently have a MODEL C5E ANALYZER Handheld Digital Oxygen Analyzer  by Nuetronics INC but it is unserviceable now. We also have one of their products that plugs in and goes down to 1ppm, ($2500 from what I remember) but we only need one of those.  So I'm wondering if anyone has recommendations about a new portable one. One that I did not like about the C5E is that the internal modules had expiration dates on them so we had to buy them yearly to keep it up to spec.  Thanks for any input on this.