Boost Nation: The socket from Tischer BMW does not have a built in torque setting, so you still need a torque wrench. There is a more expensive option available listed below that has a preset torque setting for spark plug changes (from Turner Motor Sports)
N52/N54 Spark Plug Torque Adpater Tool
Part #: 83300491130 (83 30 0 491 130)
Applications: 2006 - - (E90 E91 E92 E93 E60 E61 X3 X5 Z4)
This Genuine BMW tool is purpose built for torquing the spark plugs on the N52 and N54 engine to precisely the right torque spec. This ensures you will not over or under tighten the spark plugs on the E90/E92 3 series or 2006+ E60 5 series 6 cylinder engine.
This adapter has standard 3/8" drive receivers on it, so you can use it in line with the BMW spark plug socket (part# 83300495560) and tighten until you hear the "click", which lets you know you have applied just the right amount of torque (23nm).