Hickok 533AA Mutual Conductance Tube Tester 
Calibrated & Clean - Ready to Use
Plate Current jacks to get the plate current test results. 
Mutual Conductance bridge rebuilt with adjustable pots for calibration, and added a line adjustment pot for calibration. 
See the report!
See pictures 4 thru 7 for calibration specs and information on this 533A.
These 4 pages should tell you all you need to know about this 533A.
                                                  The Pictures ENLARGE!                                  
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. The cost for shipping in the USA will be deducted from the total cost of shipping when shipped internationally if you ask.
 
Here is what AI has to say:
The Hickok 533A Mutual Conductance Tube Tester is an exceptional tool for ensuring the quality of your vacuum tubes. This model has been carefully calibrated to ensure accuracy and reliability in all your testing needs. It also comes with plate current jacks, which have been improved to provide even better performance. With this device, you can test a wide range of tubes with ease and confidence, making it an essential addition to any electronics enthusiast's toolkit. Whether you're a professional or a hobbyist, the Hickok 533A is the perfect choice for all your tube testing needs.