Understring Radius Gauges:
Size: 3.9 x 2.0 x 0.08 inch/ 7 x 6.5x 0.2 cm
Includes 7.25/ 9.5/ 10/ 12/ 14/ 15/ 16/ 17/ 20 inch radius
Application: Measured in radians, and radians to adjust the strings piano code, obtain accurate measurements of your instrument's fretboard radius, saddle radius, nut radius from either the upper or the bottom radius surface.

String Action Gauge Ruler:
Size: 8.9 x 5.1 cm/ 3.5 x 2 inch
Double sided, marked metric and imperial
Application: measure string height, bridge height, nut slot depth, bridge slot depth and pickup height

Fret rocker:
Size: 2.7 x 2.0 x 0.08 inch/ 10 x 5 x 0.2 cm
Application: the fret rocker can span over 3 frets and can check if frets are on the same level

32 Blades feeler gauge
Measurement: The guitar feeler gauge measures from 0.0015 inch/ 0.038 mm to 0.035 inch/ 0.889 mm.
Application: The feeler gauge can be applied for guitar spacing chord distance measuring.