Use like any allen key.  Do not touch the orange plastic scale when using the TorqueKey.

The Torque can be read off the scale, when the bottom edge of the key aligns with the scale value.  This fastener is at 6Nm.

The 9point8 TorqueKey is an innovative, inexpensive alternative to costly torque wrenches.  Currently available in 4mm Allen hex, one of the most common sizes on bicycles.

The TorqueKey operates by correlating the deflection of the key to a known torque scale.  The more the key defects, the more torque is being applied to the fastener.

  Read a brief article by Mike Johnston about the importance of fastener torque here.