Electronic Timer can count the time before or after an event. When lightning the pcb with UV lightning, you have a precise time that the pcb must may be exposed to the uv light. With this simple tool you can set minutes and seconds waiting time. 10 seconds before the end time you get a alarm sound. Also you can see how much time you have left, the timer has a countdown label.
The license of this software is Freeware, you can free download and free use this digital clock & timer software.