In the case of analyzers or cash cards, they won’t stack unless they have the same number of charges or give the same number of credits.
That said, I have seen an instance of identical items not stacking (I want to say it was a TeV9, but don’t quote me on that; it’s been a while), but it only happened one time that I can recall and I’m pretty sure that was a one-off glitch.
Mod prefixes: 0xA010 (registered) and 0xDCC8 (miscellaneous)
If a device gets ionized, it will never stack with others of its kind even after ionization times out.
Download and Play in 1.9 beta 1... Drake Technologies (Alpha): More hardware for combat in parts 1 and 2! Star Castle Arcade: Play a classic arcade game adventure, with or without more features (like powerups)! Playership Drones: Buy or restore exotic ships to command!
Other playable mods from 1.8 and 1.7, waiting to be updated... Godmode v3 (WIP): Dev/cheat tool compatible with D&O parts 1 or 2.