The Thermometer-Hygrometer, cataloged under National Stock Number 6685-01-382-4699, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-382-4699 |
| Item Name | Thermometer-Hygrometer |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Relationship to Similar Equipment | REPLACES THE AIR FORCE'S CURRENT TEMP AND HUMIDITY TRANSFER STANDARDS USED IN PMEL, P/N SA-760-A NSN 6625-01-144-1855 DIGITAL READOUT AND P/N H5-3552-B (NSL) HUMIDITY PROBE |
| Scale Accuracy Rating | HUMIDITY ACCURACY +/- 2 PERCENT RH, TEMP ACCURACY +/- 0.4 DEG F DEGF |
| Measurement Type | DIGITAL |
| Reference Data and Literature | T.O. 33K1-1-100 |
| Operating Temp Range | -20.0 TO 60.0 CELSIUS DEGC |
| Functional Description | THE PROTIMETER DEWPOINT METER USES ANALOG AND DIGITAL ELECTRONICS TO SIMPLIFY ACCURATE AND STABLE HYGROMETRIC MEASUREMENT; DIRECT MEASUREMENT OF DEWPOINT TEMPERATURE |
| Measurement Range | +10.0 TO 100.0 PERCENT RELATIVE HUMIDITY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| DP989M | 5/9 Secondary reference Protimeter Inc |
| MODEL 989M | 3/9 Design control — primary reference Protimeter Inc |
NSN 6685-01-382-4699 is a Thermometer-Hygrometer, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
Key specifications for 6685-01-382-4699: Relationship to Similar Equipment: REPLACES THE AIR FORCE'S CURRENT TEMP AND HUMIDITY TRANSFER STANDARDS USED IN PMEL, P/N SA-760-A NSN 6625-01-144-1855 DIGITAL READOUT AND P/N H5-3552-B (NSL) HUMIDITY PROBE; Scale Accuracy Rating: HUMIDITY ACCURACY +/- 2 PERCENT RH, TEMP ACCURACY +/- 0.4 DEG F DEGF; Measurement Type: DIGITAL; Reference Data and Literature: T.O. 33K1-1-100. 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.