Abstract: A device for securing a combination dial lock is comprised of a base member, a bridge member, which is pivotally mounted on the base member, and a cover member which substantially envelopes both the base member and the bridge member. The bridge member includes a pin member projecting from a tip thereof for being inserted in a complementary opening in the combination dial to secure the dial against rotation. Tamper alarm circuitry is provided to generate a tamper alarm signal if an attempt is made to tamper with the combination dial or to damage the device. An alarm will also be generated if the lock remains in an unsecure state for more than a predetermined time interval, which is deemed adequate for an authorized user to conduct legitimate business in the compartment which is being protected by the combination dial lock.