helium analyzer

Used Analytical Industries 4001 Helium Oxygen Trimix Analyzer. In good working condition, with some wear on the outside (see photos). Battery replaced in August 2022. O2 sensor replaced in April 2022. Helium sensor was manufactured in September 2016. I spoke to AII: because the helium...

Hi all, I have one of the Oxycheq He Analyzers and need a battery pack for it. A new battery pack from the manufacturer costs about $70. In my opinion, this is a little bit on the high end, especially since I like non-rechargeable batteries much better for this purpose. Does anybody know which...