Mitutoyo Wire Guide Pulley for LSM-501S Mitutoyo offers this Wire Guide Pulley made specifically for use with the LSM-501S. Mitutoyo 's Laser Scan Micrometer model LSM-501S is designed for measuring "Fine" wire thickness / diameter. The measuring range of the LSM-501S is 0.002" - 0.4" / 0.05mm - 10mm. This Wire Guide Pulley can be attached directly to the base of the Laser Scan Micrometer, allowing the wire to be located directly in the middle of the laser measuring beam.