The back contains 4 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
| Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
| Cotangent | 0 - 50, Fingers | Every 5 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
| Shadow square | 0 - 12, Fingers | Every 3 fingers | Box | Lower left quadrant |
| Dastūr Circle | None | None | Upper left quadrant (inside circular scales) | |
| Dastūr Circle | None | None | Upper right quadrant (inside circular scales) |