• American Reliance
  
• Amprobe Instruments
  
• B&K Presicion Instruments
  
• FW Bell
  
• Bird Electronic Corp.
  
• Extech Instruments
  
• Fluke Electronics
  
• Huntron Instruments
  
• Progressive Electronics Inc.
  
• Simpson Electric Co.
  
• Wavetek/Beckman Instruments Inc.