HOSCO Radius Gauge has 2 functions. One is fingerboard radius gauge. It has 6 major different radius. Another is 0.2mm pitch string action gauge. This is very unique tool for guitar builders and players.

H-RG1B HOSCO Radius Gauge

7-1/4", 9-1/2", 10", 12", 14", 16" radius gauge + string action gauge (0.2mm pitch checking)
Material: Stainless steel
Size: 200mm x 24mm

<How to use string action gauge>

1. Orange line is started from 1.0mm height to 2.0mm. Green line is started from 2.0mm to 3.0mm.
2. The cross point of blue line and orange line is 1.0mm and the cross point of yellow and orange is 1.2mm.
3. Red line is the bottom of string and red line is crossing to green line. You read the cross point of red and green.
4. This cross point of green and red is yellow line (0.2mm line). So the string height is 2.2mm.

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