Hickok 752A Mutual Conductanc Tube Tester
The 752A was made for the FAA and can test dual triodes using only one setting
 
Calibrated - Ready to Use
Free Insured Shipping in USA (48 contiguous)
 
Please see pictures 6, 7, 8, and 9, for the calibration report and other important information, and page 10 explains the difference in bias voltages used by the FAA. 
These 4 pages will tell you all you need to know about this 533A.

It comes with a paper manual and obsolete tube data book, and a DVD with several manuals and tube data including Western Electric tube data, lots of other tube data, or I can send these PDF files via email upon request.

The case is in fair condition and surdy.
 
Please see the calibration information in the pictures.
 
Free Insured Shipping in 48 Contiguous USA
 
Please contact in advance of purchase for shipping costs internationally. You can generally determine the shipping costs to your location by using 24X18X12” box weighing 26 pounds shipped from zip code 86332. We ship internationally with FedEx and USPS