Subject of the Auction: Professional Electron Tube Measuring Equipment (1920-40s) This auction offers professional measuring equipment for electron tubes manufactured since the 1920s. The electron tube emission meter allows for a variety of measurements on various tube elements and models, including diodes, triodes, pentodes, and more. This well-maintained meter remains fully functional – it's not an old, useless exhibit! This equipment is an essential tool for both professionals and collectors. With this meter, you can easily diagnose tube radio components and save money on servicing vintage equipment, which is becoming increasingly scarce. The set includes everything you need to begin working on or restoring tube devices. Included are copies of the original operating, calibration, repair, and modernization instructions for the meter, translated into English for your convenience. The set also boasts a comprehensive reference guide for vacuum tubes and their international equivalents with reference parameters. The carrying case is in good condition with visible signs of use. As this is a unique opportunity to acquire a well-maintained piece of vintage equipment, I will ensure it is safely delivered to you with shipping insurance.