Burst-Tel provides a simple and effective means of identifying when a bursting disc functions. It comprises a polyamide membrane onto which is bonded an insulated, electrically conductive path mounted between supporting rings. Installed on the vent side of the bursting disc device, Burst-Tel is activated by fluid flow when the bursting disc functions, causing the conductive path to break and give an open-circuit signal. Following the disc burst, Burst-Tel is simply replaced along with the bursting disc.