IN-13 is linear gas discharge indicator, intended to display electrical values, transforming them into glowing bar. Indicator can be used to control various parameters, state of technological processes, in information panels and in measuring devices. Indicating - through side panel of the tube. Glowing color: pink - orange. Filling gas - neon. Bar length (total) - 4,72 inch (120mm). Diamether - 0.394 inch (10mm). IN-13 nixie bargraph tubes has been used but shows minimal signs of use or don't have them at all, made in 70-80s, have a short pins, tested 100%!

See example: Music Visualizer with IN-13 Nixie bargraph tubes