| KNOB PURPOSE | FOR SETTING BAROMETRIC SCALE |
| KNOB QUANTITY | 1 |
| OVERALL DEPTH | 4.875 INCHES NOMINAL |
| 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 |
| NONLUMINOUS SCALE MARKING AND COLOR | LETTERS WHITE AND NUMERALS WHITE AND LINED INCREMENTS WHITE |
| POINTER COLOR | WHITE |
| POINTER FINISH | NONLUMINOUS |
| POINTER QUANTITY | 3 |
| REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS | W/LONG KNOB AND MODIFIED IN ACCORDANCE W/BUAER DWG 55A12A1 AND NAVY AIRCRAFT INSTRUMENT BULLETIN 259 BY REPLIES ASPG,ASPD |
| SCALE MARKING AND SURFACE FINISH | LETTERS NONLUMINOUS AND NUMERALS NONLUMINOUS AND LINED INCREMENTS NONLUMINOUS |
| SCALE QUANTITY | 2 |
| SCALE NAME | ALTITUDE AND BAROMETRIC PRESSURE |
| SCALE SMALLEST INCREMENT GRADUATION | 20 FT,0.020 IN. MERCURY |