| 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 |
| NONDEFINITIVE SPEC/STD DATA | MB-1A TYPE |
| NONLUMINOUS SCALE MARKING AND COLOR | LETTERS WHITE AND LINED INCREMENTS WHITE AND NUMERALS WHITE |
| POINTER FINISH | NONLUMINOUS |
| POINTER QUANTITY | 2 AND 1 |
| SCALE QUANTITY | 2 |
| SCALE NAME | ALTITUDE AND BAROMETRIC PRESSURE |
| SCALE SMALLEST INCREMENT GRADUATION | 20 FT,0.020 IN. |