- Version 1: Scanning head suspension – standard with scanning head TK326
- Version 2: Scanning head suspension – advanced with scanning head TK325
- Version 3: Movable scanning head suspension with scanning head TK325
- Version 1: Multi-position error calculator DS421 with display module DSA400
- Version 2: Digital measuring system STM4000 and all STM4xxx components for extension.
- Version 3: Digital measuring system STM6000 and all STM6xxx components for extension.
- Light barrier with coloured indication