Lightnin Variable Speed Open Tank Mixer. Model: NS2V. S/N: 704852. This Lightnin accessory is your solution for the following applications: changes in viscosity, varying liquid levels, aeration control, pilot plant studies, multiple step operations, reduced speeds during drainage. Positive drive chuck. Maximum propeller shaft diameter: 5/8 in. Lightnin motor: 1/2 hp, 1,725 rpm, 117/350 rpm (min/max), 230/460 V, 3.2/1.6 amps, 60 cycles, 3 phase. Overall dimensions: 1 ft. 5 in. L x 7-1/2 in. W x 2 ft. 9 in. H.