The Thermometer-Hygrometer, cataloged under National Stock Number 6685-01-587-3651, 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 Process Sensing Technologies Corp. Dba Rotronic Instrument Corp. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 6685-01-587-3651 |
| Primary Part Number | HF8 |
| Item Name | Thermometer-Hygrometer |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Process Sensing Technologies Corp. Dba Rotronic Instrument Corp |
| Status | ACTIVE |
| 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 |
|---|---|
| HF8 PRIMARY | Process Sensing Technologies Corp. Dba Rotronic Instrument Corp (USA) |
NSN 6685-01-587-3651 is a Thermometer-Hygrometer, manufactured by Process Sensing Technologies Corp. Dba Rotronic Instrument Corp, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-587-3651 has 1 manufacturer part number on file: HF8 (Process Sensing Technologies Corp. Dba Rotronic Instrument Corp).
1 possible match (shared part number, not a government interchangeability claim): 3455-01-659-8385. Verify interchangeability with system specifications before substitution.
Key specifications for HF8: Part Name Assigned by Controlling Agency: HYGROTHERMOMETER, DIGITAL. 0 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.