Options 
Marathon MM  Rev. D7 Jul 2017  49 
8 Options 
Options are items that are factory installed and must be specified at time of order. The following are 
available: 
• Laser Sighting (…L) or Video Sighting (…V) 
• Air/Water Cooled Housing including air purge 
• Manufacturer's Calibration Certificate based on certified probes traced on national standards, e.g. 
DAkkS (XXXMMCERT) 
• Variable Focus (…VF1), see section 3.2.1 Variable Focus, page 16 
8.1 Laser Sighting 
The laser sighting allows fast and precise aiming at small, rapidly moving targets, or targets passing at 
irregular intervals. The laser is specially aligned with the sensor’s lens to provide accurate, non-parallax 
pinpointing of targets. The laser comes as a small, bright red spot indicating the center of the area being 
measured. 
 
Figure 28: Spot Size Indication 
For activating the laser sighting see Figure 13: Operation Modes on page 35. 
The  laser  is  a  Class  II,  AlGaInP  type  laser  with  an  output  power  less  than  1  mW,  and  an  output 
wavelength  of  650  nm.  The  laser  complies  with  FDA  Radiation  Performance  Standards,  21CFR, 
subchapter J, and meets IEC 825, Class 2 specifications. 
WARNING! 
Avoid exposure to laser light! Eye damage can result. 
Use extreme caution when operating! 
Never point at another person!