Available in 3 models - 5ul-40, 40ul-200, 200ul-1000ul. Ergonomic design, light weight construction reduces strain on your hand. Piston action smooth and controllable. Two step operation reduces use of reverse pipetting from same tip, ensures last drop dispersing. Click stop with automatic locking system on upper volume. It clicks to desired volume and stays there even after large no. Of dispensing. Highest level of accuracy and precision.