The Pyrometer,indicating, cataloged under National Stock Number 6685-01-451-6321, 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 Control Products Inc. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-451-6321 |
| Primary Part Number | 999J |
| Item Name | Pyrometer,indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Control Products Inc |
| Status | ACTIVE |
| Scale Accuracy Rating | 0.5 PERCENT |
| Measurement Type | THERMOELECTRICAL CIRCUIT |
| Scale Type | HORIZONTAL |
| Scale Measurement Range | +0.000 TO 120.000 DEG FAHRENHEIT |
| Functional Description | A 3 PIECE UNIT CONSISTING OF A INFRARED TEMPERATURE SENSOR, SIGNAL CONDITIONER, AND DISPLAY USED TO MONITOR SURFACE TEMPERTURES USED TO DETERMINE THE AMOUNTS OF SALT TO SPREAD TO PREVENT FREEZING OF ROAD AND FLIGHTLINE SURFACES |
| 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 |
|---|---|
| 999J PRIMARY | Control Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 994A | 5/9 Secondary reference Control Products Inc |
NSN 6685-01-451-6321 is a Pyrometer,indicating, manufactured by Control Products Inc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-451-6321 has 1 manufacturer part number on file: 999J (Control Products Inc).
1 possible match (shared part number, not a government interchangeability claim): 5120-01-671-7101. Verify interchangeability with system specifications before substitution.
Key specifications for 999J: Scale Accuracy Rating: 0.5 PERCENT; Measurement Type: THERMOELECTRICAL CIRCUIT; Scale Type: HORIZONTAL; Scale Measurement Range: +0.000 TO 120.000 DEG FAHRENHEIT. 5 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.