The Cobra Pipettor System offers an ergonomic solution to single channel variable volume pipetting applications. These devices feature a soft spring system for extremely low pipetting forces and an adjustable tip-ejector button to provide the best fit and ejection for right- or left-handed use in any hand size. A large, arched finger hook design provides all-day comfort and reduces tension for all hand sizes. The higher hook positions the thumb much closer to the push button, further reducing overall pipetting forces. All Cobra® Single Channel Pipettors are lightweight with durable construction.