The 001 Workshop Service Tools assembly is constructed from several parts from which the Torque Wrench For Timing Belt is the most expensive.
Some items from this specific schematic: Goniometer Ignition Timing Checking, Plate For Positioning Gear Engagement, Clutch Screw, Timing Pulley Retaining Wrench.
The lowest price component in this 001 Workshop Service Tools parts-list fiche is the Rocker Assembling Pin.