The Good
Light pipetting and purging forces
The Bad
No anti-drift locking mechanisms
The Bottom Line
These are good, affordable pipettes. The light pipetting and purging forces make it much more comfortable to use at the bench. While there are no anti-drift (locking) mechanisms, it does not cause a problem because the volume adjustment knob has enough friction that the volume won't change on its own. However, because of this high friction, adjusting the volume requires a little more force.