Device for displaying the current time with high precision (±100μs), designed to verify the accuracy of time-stamping by vision systems. The time is displayed on ten 7-segment digits built with red LED diodes of high brightness. The dimensions of the digits are similar to the size of characters on license plates. The clock synchronizes time with the GNSS source and indicates whether the source is available. The device is designed to verify the accuracy of the time signature attached to photos, for example in speed measurement systems for sections of road.