Tag Heuer have a long established relationship with Mercedes in the field of motorsport and more recently in a line of watches inspired by the Mercedes McLaren SLR. The latest watch is the Tag Heuer SLR Laptimer Chronograph which features the Calibre S electro-mechanical chronograph movement which can measure times of up to a hundredth of a second. The Tag Heuer SLR Laptimer Chronograph will be available in limited quantities this fall from Tag Heuer stores.