Preferably with case. Don't mind if it needs new cell or battery, provided the asking price reflects this & it's otherwise in working order.
Thanks for the info. I'd heard that these two brands are good, in part because they have an internal sensor (less prone to wearing out/ being damaged). I'm happy to look at other brands if their units are reliable and have user-changeable cells & batteries.Why limit yourself to those two? Dunno what cell the OxySpy uses, but the Analox uses one that isn't used in any CCRs meaning you will need to buy new ones rather than scrounging old ones that still have a couple of years use in them. I use a Vandagraph VN202 which uses old Sentinel/Boris cells and can use any cell with a patch cable costing less that £2.