The main difference between beierplasm K85 and plasma pen K29 is the continuous working mode. For a long term treatment, handle a machine to do small wrinkle even eye around treatment is difficult. What's more K29 have to press trigger for each shooting. But K85 could continuous work.

On the other hand, K85 power more " soft ", even the fire not that big as K29. However it could reach deeper skin layer and not that hurt to skin, but reach better benefits.