This is a Hickcock 533 tube tester I\'ve owned it for about 10 to 15 years it has been stored in the closet inside the house I use it on a when needed basis whenever I need to test tubes I would say couple of times a year it is very accurate I have never had a problem with it. it\'s a great piece of equipment. the case is a little rough on the outside but never interested me as I need to test tubes!!!! The scroll chart works fine. All switches,sockets,lightbulbs,meter, all work perfect

If you\'re using tube equipment this is definitely a must-have takes lot of the guesswork out of problems and troubleshooting