Reversible top platform cup or flat-dimpled surface Powerful motor for INSTANT vortexing Continuous or touch operation Q-Drivedynamic balancing system Variable speed from 200 to 3200 rpm Wide variety of accessories for tubes up to 50ml The new Alkali Benchmixer V2 BV1003 vortex mixer combines the familiar powerhouse motor of the classic Benchmixer with a new reversible head that expands the range of your mixer at NO extra cost The BenchMixerV2 utilizes a smooth and powerful mixing technology similar to the original BenchMixer with the advantageof a uniquely designed reversible rubber head that can be attached to the mixer in two orientations For the vortexing of single tubes the cupped surface would generally be preferred However for applications requiring a flat/dimpled surface for mixing uniquely shaped vessels (or a handful of multiple test-tubes) the head can easily be flipped over and reattached in reverse orientation Like the original BenchMixer the drive system is balanced