IN-12 is a glow discharge indicator that displays information on a glass dome of orange glow.

Specifications IN-12
ignition voltage - <170V;
cathode constant current nominal (maximum) - 2.5mA (3mA);
pulsating cathode current - 1..2mA;
viewing angle, not less than - 60 ° (± 30 °);

supply voltage - 250V.

IN-15 - glow discharge indicators. Designed to indicate various letters and signs.

The IN-15 (A, B) indicators are similar in overall dimensions and electrical parameters to the IN-12 (A, B) digital indicators and can be used together with them in a single design.