Manufacturer/Supplier to the Pyrotechnic Community
This small device is roughly the size of a quarter. It has a 3 volt lithium button battery which should last (under normal conditions) five years+. The measured current thru a typical match is less than 10mA. Although well below the 50mA Max test limit, all precautions should be taken. All personnel should be distant from the devices under test.
By placing one wire of an electric match to the button battery, and the other wire to the ODA pattern on the other side, and squeezing slightly, the LED will light - if there is continuity.