Pads for Omron PM series
Omron PM series leads end in a snap. These packs carry the matching stud in the sizes those units expect.

20 Pcs Replacement Pads Compatible with Omron TENS Units
Omron PM series

DOMAS 6 Pcs Large TENS Electrode Pads for Omron TENS Units Only
Omron PM series

10 Pcs Replacement Pads Compatible with Omron TENS Units
Omron PM series
Other unit families
DOMAS units
Pads and spares for the units we build ourselves, including the two 24 mode machines and the belt.
TENS 7000 and other 2 mm pin units
The 2.0 mm pin is the most common terminal on the shelf. If your lead ends in a bare metal post, these are your packs.
PowerDot 2.0
The PowerDot 2.0 connector holds by magnet, so its pads carry a raised magnetic contact rather than a socket or a stud. One pack here is cut for it.