A low priced gain/isolation tester with digital precision. A must for testing and matching tubes. Sockets for the most popular amplifier tubes types(like ECC81-83, 12AT7, 12AU7,12AX7, 6L6, KT66-88, 5871, 6550, B300 etc) mail for list. For 110-240V AC. Made i EU(Sweden). Looking for dealers in US, UK & Germany. jan_lense@yahoo.se