^^ Part of my calibration equipment bench :) ^^
My name is Phil Frakes. I'm the guy who invented and brought you the Computerized Cardmatic Tube Testers. Please click on the link for more information.
I also specialize in refurbishing certain other types of test equipment. I have a well-equipped calibration lab, in which certain critical pieces of it have valid NIST calibration certificates. These are used to calibrate the rest of the equipment in the lab as needed. That, in addition to double and triple cross-checks, means I can provide very precise calibrations, but no certificate. Contact me if such a certificate is required.