The Feeler Gauge is used by many luthiers and guitar techs as an accurate tool to measure neck relief, action, pickup heights and nut saddle depths.   
 
 Comes with a mini setup card.
 
Metric Feeler Gauge 0.05mm - 1.00mm - 13 Blades
 
(0.05mm, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.0mm)
 
Alloy Steel Casing