This German standard is similar to ISO 3159 that forms the basis for . Watches are tested for compliance with DIN 8319 at Glashtte Observatory. The DIN 8319 procedure requires 15 days of testing, in the same as for COSC (dial up, dial down, crown left, crown on top, crown below), with an average daily rate variation between -4 and 6 seconds. Average daily rate deviation must not exceed 2 seconds, and largest rate deviation must not exceed 5 seconds. Watches are tested at 23C, 8C and 38C. Watches are wound once every 24 hours. On the tenth day of testing, any complications (typically a chronograph) are activated to ensure that they do not detrimentally affect precision.