From Rt. 91 (north of Hartford)
Take Exit 35A, "291 Manchester" (i.e., 291 EAST)

Take Exit 4, "Rt. 5 South Windsor"
Turn LEFT off exit ramp onto Rt. 5 NORTH
Drive 3.1 miles on Rt. 5

(Note: you will go through ~6 lights; a landmark at the last light is Nassau's Furniture on the LEFT of the intersection. From that point, Kimberly Drive is 0.4 miles and is a crossover break in the center barrier. MTC is located in the Charbonneau Industrial Park, its small sign is ~ 10' tall, 6' wide with a teal colored header [i.e., easy to miss])

Turn LEFT onto Kimberly Drive
Metals Testing Company is ¼ mile on RIGHT