MACHINE TOOL DEVICE

The invention relates to a machine tool device， in particular for a chain saw， comprising at least one working unit (12a)， in particular an insertion tool， comprising at least one fluid line (14a; 14b) which is provided to supply the working unit (12a) with a fluid， in particular a lubricating oil， and comprising at least one sensor unit (16a; 16b) arranged on the fluid line (14a; 14b). According to the invention， the at least one sensor unit (16a; 16b) is designed to ray-optically detect at least one fluid flow characteristic variable， in particular a fluid flow volume.