Mechanical Acuity is a crafted set and is available in all armor types. When you deal direct damage, you have a 15% chance to gain unerring mechanical vision for 5 seconds, causing your attacks to always be a Critical Strike. This effect can occur once every 18 seconds.
Mechanical Acuity gives you a 100% spell & weapon crit rating for 5 seconds. It simply adds a flat 100% crit to both stats, so you can end up with over 100% crit, which doesn’t really matter as there will be no difference anyway the moment you hit 100%. The effect lasts for a total of 5 seconds and then has a cooldown of 18 seconds. You can get an about 26-29% uptime with this set as long as you use Force Pulse, because it only activates on direct damage. Mechanical Acuity becomes a very powerful set in the hands of a player who can time their weapon swaps and attacks and take full advantage of the crit bonus by adjusting their DPS rotation around it.
You can proc this set from distance with for example bow light or destruction staff light attacks.
The Mechanical Acuity set is part of the Clockwork City DLC. The crafting station is located in Clockwork City, south of the Clockwork Crossroads Wayshrine (Pavillion of Artifice). You need to have at least 6 traits researched to be able to craft this set. You can craft the set in any trait and motif style that you know, and you can trade the crafted item pieces to other players. Each set item becomes bound on equip.