Which is a tier 2 implant. You can easily see what tier each implant is just by looking at its color and energy consumption rate.
Marker has no tier. It is a Tier 2 as the above person said. Battle hardened only exists in Tier 1. There are several implants that ONLY exist at Tier 3 level.
Here's some info on the different implants and tiers. http://planetside.wikia.com/wiki/Implants As was said above, some implants only exist as one specific tier.