The Model 625 Tube Tester has been designed to test practically all current radio and television receiving and a number of commonly encountered transmitting tubes. With this basic purpose in mind, concentration is next placed on simplicity of operation and circuit flexibility regarding new or future tubes. SPECIAL FEATURES: Tests practically all tubes as described above. Speed type lever switches- speed and accuracy, Individual tube element testing. Specially designed against obsolescence to accommodate future tubes. Circuit overload bulb- indicates overload on transformer. Short test- indicates shorted tube elements. Large- easy-to-read meter. Illuminated- no backlash- speed roll chart- simplifies reading and finding of tubes. Lifetime etched, rub-proof panel. Durable steel carrying case. Electrical specifications: 105-125V AC, 50-60 cycles. Mechanical specifications: 12 1/2" wide; 5 1/2" deep; 11 1/2" high.