The Barometer,mercurial, cataloged under National Stock Number 6685-00-511-9864, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Honeywell Intl Inc Defense Avionics Systems. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-511-9864 |
| Primary Part Number | 12700-2B |
| Item Name | Barometer,mercurial |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Honeywell Intl Inc Defense Avionics Systems |
| Status | ACTIVE |
| Cistern Type | GLASS CYLINDER |
| Reference Data and Literature | TM 55-405-10 |
| Scale Range | -1000.0 TO 80000.0 FEET OF ALTITUDE AND +0.0 TO 800.0 MILLIMETERS OF MERCURY MM |
| Graduation Unit | 1000.000 FEET AND 1.0 CENTIMETERS CM |
| Functional Classification | AA-8.4 |
| Entry Date | 70-08-15 |
| Functional Description | USED FOR TESTING ALTIMETERS INSTALLED IN ACFT; U/W EXT VACUUM SOURCE; ALTITUDE READINGS SHOWN & COMPARED W/ALTIMETER UNDERGOING TEST ON GRADUATED HG TUBE SCALE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 12700-2B PRIMARY | Honeywell Intl Inc Defense Avionics Systems (USA) |
| Reference | Meaning |
|---|---|
| MIL-B-4308B | 5/9 Secondary reference U.S. Government activity |
NSN 6685-00-511-9864 is a Barometer,mercurial, manufactured by Honeywell Intl Inc Defense Avionics Systems, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-511-9864 has 1 manufacturer part number on file: 12700-2B (Honeywell Intl Inc Defense Avionics Systems).
Key specifications for 12700-2B: Overall Height: 12.000 INCHES NOMINAL IN; Cistern Type: GLASS CYLINDER; Reference Data and Literature: TM 55-405-10; Scale Range: -1000.0 TO 80000.0 FEET OF ALTITUDE AND +0.0 TO 800.0 MILLIMETERS OF MERCURY MM. 7 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.