| KNOB PURPOSE | FOR SETTING BAROMETRIC SCALE |
| KNOB QUANTITY | 1 |
| OVERALL DEPTH | 3.875 INCHES MINIMUM AND 4.125 INCHES MAXIMUM |
| OVERALL HEIGHT | 3.250 INCHES NOMINAL |
| OVERALL WIDTH | 3.250 INCHES NOMINAL |
| MECHANICAL CONNECTION QUANTITY | 1 |
| MECHANICAL CONNECTION SIZE | 1/8 IN. |
| MECHANICAL CONNECTION TYPE | INTERNAL PIPE |
| MOUNTING METHOD | THREADED BEZEL |
| POINTER FINISH | FLUORESCENT |
| POINTER QUANTITY | 3 |
| SCALE MARKING AND SURFACE FINISH | LETTERS FLUORESCENT AND NUMERALS FLUORESCENT AND LINED INCREMENTS FLUORESCENT |
| SCALE NAME | ALTITUDE AND BAROMETRIC PRESSURE |
| SCALE QUANTITY | 2 |
| SCALE SMALLEST INCREMENT GRADUATION | 20 FT,0.020 IN. |