Audemars Piguet Royal Oak Boutique Edition 41mm Blue Dial 15400ST
As part of our commitment to transparency, we're showing you this watch on our timegrapher. Testing is done in six positions, covering how the watch is worn in daily use.
Timegraphers listen to the ticks which a movement make. Professional machines like ours can take more measurements, create a graph, and support more escapement types.
"Accuracy" refers to how many seconds a movement gains or loses each day. COSC standards require -4/+6 seconds a day, while vintage watches may read closer to -60/+60s.
"Amplitude" tells you how much the balance wheel is moving each rotation. Certain escapements have a higher amplitude, while some will have a lower value by default. A below-average reading for your watch's escapement suggests there is friction in the movement from a lack of lubrication.
"Beat error" is, more simply, the difference between the "tick" and the "tock". In modern watches, a reading under to 1.0ms should be expected, while vintage watches may have a reading of up to 3.0ms.