IN-1 is a cold cathode neon gas indicator displays digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Indicating current (no more than): 2.5mA; Keep-up voltage (no more than): 150V; Firing voltage (no more than): 200V; Length of the tube (without pins): 60mm; Diameter of the tube: 30mm; Symbol size: 0.74"x0.4" (18 x 10 mm).