The ZM1000 is a clear class numerical nixie tube manufactured by Dario, it has the rather uncommon "Eurogrid" base. This tube has a unique look by its fine meshed anode grid, and its perfect for medium sized nixie projects, but be advised that implementing a backlight could be very hard due its special base. This tube not easy to find but also not very rare. There is a matching special character tube, the ZM1001, and also a red coated version the ZM????.