Unistik 2 Normal.

One of the best auto lancets for microscopists. Spring loaded, lancet retracts back into body of device after use for safety. Disposable.

Unistik 2 Extra.

Provides deeper poke for tougher, thicker skin or for more more generous sample.

This is the only lancet in the market that you can actually reset the spring. Sometimes a person will move their finger just as you press the release. Instead of having a perfectly good unused lancet go to waste, here you can re-cock it for the individual you were using it with.