Control Panel The two adjustment knobs can respectively control the time and speed. Speed range is 0-4000r/min. Time range is 0-120min. Maximum relative Centrifugal force: 2770×g. 20ml x 12 tubes The tubes should be symmetrically inserted into the rotor body. If the running pattern is singular, the same amount of water can be added to the symmetrical test tubes to achieve balance. Test tube capacity It is recommended that the capacity of centrifuge tubes should be no less than 30% and no more than 80% filled. Warm prompt: 1, Please insert 2/3/4/6pcs tubes into the holes of rotor symmetrically, if placement position is not symmetrical, the machine will not work normally. 2. If you need to separate 1 liquid tube, please use one more tube and add water as much as the liquid tube to realize symmetric operation. 80-2 electric centrifuge 20ml x 12 Tubes Capacity Specifications: Speed Range：0-4000r/min Relative Centrifugal Force：2770×g（Max.) Tube Capacity: 20ml x 12 Timing Range：0-120min Electric Current：AC110V 60HZ Package Includes: 1 x electric centrifuge ( Include tubes)