If you get both a 3/8" In lb and a 1/2" ft lb, you do have some overlap for better accuracy. For ft lb readings that are right at or below the lowest setting on the 1/2" torque wrench, simple multiple the required ft lb measurement times 12. That'll give you the in.lb equivalent to use with the 3/8" torque wrench.

 

Also perhaps an 3/8 to 1/4 inch adapter while your at Sears for those small sizes. IMHO

 

I was just going to suggest that. 3/8 female to go on the torque wrench with 1/4 male to accept 1/4 drive torx sockets ect.