The Pyrometer,indicating, cataloged under National Stock Number 6685-01-042-3529, 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 Phaostron Instrument and Electronic Company. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-042-3529 |
| Primary Part Number | 643-16770 |
| Item Name | Pyrometer,indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Phaostron Instrument and Electronic Company |
| Status | ACTIVE |
| Scale Smallest Increment | 25.0 DEG FAHRENHEIT |
| Scale Accuracy Rating | 1 PCT ENTIRE RANGE |
| Scale Type | METER DIAL |
| Case Type | DRIPPROOF |
| 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 |
|---|---|
| 643-16770 PRIMARY | Phaostron Instrument and Electronic Company (USA) |
| 4220S004-11 | L-3 Communications Westwood Corporation Dba Edi Division Div Tano Division (USA) |
| 445-013 | Jewell Instruments Llc (USA) |
NSN 6685-01-042-3529 is a Pyrometer,indicating, manufactured by Phaostron Instrument and Electronic Company, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-042-3529 has 3 manufacturer part numbers on file: 643-16770 (Phaostron Instrument and Electronic Company), 4220S004-11 (L-3 Communications Westwood Corporation Dba Edi Division Div Tano Division), 445-013 (Jewell Instruments Llc).
3 possible matches (shared part number, not a government interchangeability claim): 5950-01-155-3758, 2920-01-259-5734, 5970-01-406-4261. Verify interchangeability with system specifications before substitution.
Key specifications for 643-16770: Scale Smallest Increment: 25.0 DEG FAHRENHEIT; Scale Accuracy Rating: 1 PCT ENTIRE RANGE; Scale Type: METER DIAL; Case Type: DRIPPROOF. 4 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.