The S-4100 is an ergonomic boom stand.  The S-4100 includes a vertical pillar, horizontal crossarm, and a 20mm drop down mount that accepts Meiji Techno F, FX and FC focus blocks (sold separately).  Focus blocks from other manufacturers can be used as well, provided they contain a 20mm mounting hole.
 
The S-4100 is designed for use with many Meiji Techno stereo microscopes, including the EMZ, EMT and EMF series (zoom, turret and fixed models). 
 
 
The list below provides a brief overview of Meiji Techno boom stands.  The main difference between these products are as follows:

• the length of the vertical post
• a weighted base versus a table edge clamp
• mount style on the end of horizontal portion

 
S-4100

• Vertical pole – 400mm
• Horizontal pole – 530mm
• Base – 265 x 265 x 25mm, 35 pounds
• Accepts F, FX, FC focus blocks (or any with 20mm mounting hole)

S-4200

• Vertical pole – 610mm
• Horizontal pole – 530mm
• Base – 265 x 265 x 25mm, 35 pounds
• Accepts F, FX, FC focus blocks (or any with 20mm mounting hole)

S-4300

• Vertical pole – 400mm
• Horizontal pole – 530mm
• Base – 265 x 265 x 25mm, 35 pounds
• Has bonder mount at end of horizontal arm (uses 5/8 inch mounting dowel)
• Accepts FS, FSC focus blocks

S-4400

• Vertical pole – 610mm
• Horizontal pole – 530mm
• Base – 265 x 265 x 25mm, 35 pounds
• Has bonder mount at end of horizontal arm (uses 5/8 inch mounting dowel)
• Accepts FS, FSC focus blocks

S-4500

• Vertical pole – 400mm
• Horizontal pole – 530mm
• Accepts F, FX, FC focus blocks (or any with 20mm mounting hole)
• Has table clamp mount

S-4600

• Vertical pole – 610mm
• Horizontal pole – 530mm
• Accepts F, FX, FC focus blocks (or any with 20mm mounting hole)
• Has table clamp mount