Analytical Industries AII-4001 Helium Oxygen Trimix Analyzer... in superb condition. This has been meticulously maintained. Oxygen cell was replaced 02/2024. Helium sensor and environmental sensor do not have manufacture dates on them, I presume they are original. The internals/board look perfect, no corrosion. Battery is rechargeable and comes with charging cable. There is one small dimple in the screen, likely from being stored/closed with the flow limiter sitting on top of the screen. Verified all cells are working perfectly with a known gas (see video). These retail for around $900.
