It uniformly stirs up to 6 samples simultaneously. Designed for floc formation tests in water treatment plants with variable speed from 10 to 100 RPM 1/20 hp motor. Entire unit mounted on mild sheet housing and supported by 9-1/2" above bench on four posts. Stainless steel stirrers 1 x 3 inches are attached to rods 10-1/4" long x ¼" diameter with lifting knob at top. Locking collars in stirring rods permits adjustments of paddle height. Spacing of 6" between rods permits use of 1000ml beakers, which rests directly on bench. Operates on 220V 50 c/s AC.