CDI 2-8nm Adjustable Torque tool. On sale for $40
The Link is the best price on the internet right now. They retail for over $100, and wholesale is over $55, not sure why this site is so cheap. I have purchased form them in the past, reputable tool company out of Florida.
CDI is the torque tool division of Snap-On tools. Its an American company, and supplier to General Service Administration of the U.S. Government.
This tool accepts any 1/4" hex bit you already own. Plus it includes a 4 mm, 5 mm, 6 mm, T25, and 4" Long 4mm, 4" Long T25 Bit.