Toro GROUNDSMASTER 580-D 30581 Operator's Manual page 5

Safety Instructions
Vibration Levels
This unit has a vibration level of 2.5 m/s 2 at the posterior,
based on measurements of identical machines per ISO
5349 procedures.
This unit does not exceed a vibration level of 0.5 m/s 2 at
the posterior based on measurements of identical
machines per ISO 2631 procedures.
5