The Hygrothermograph, cataloged under National Stock Number 6685-01-443-4032, 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 Vaisala Inc.. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-443-4032 |
| Primary Part Number | HM41 |
| Item Name | Hygrothermograph |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Vaisala Inc. |
| Status | ACTIVE |
| Case Type | RECTANGULAR |
| Measurement Range | -20.0 TO 60.0 DEG CELSIUS AND +0.0 TO 100.0 PERCENT RELATIVE HUMIDITY |
| Voltage Rating in Volts | 9.0 DC NOMINAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
NSN 6685-01-443-4032 is a Hygrothermograph, manufactured by Vaisala Inc., classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-443-4032 has 2 manufacturer part numbers on file: HM41 (Vaisala Inc.), HM34 (Vaisala Pty Ltd).
2 possible matches (shared part number, not a government interchangeability claim): 4720-01-466-0130, 4720-01-466-1111. Verify interchangeability with system specifications before substitution.
Key specifications for HM41: Overall Height: 27.0 MILLIMETERS NOMINAL MM; Overall Length: 160.0 MILLIMETERS NOMINAL MM; Overall Width: 57.0 MILLIMETERS NOMINAL MM; Case Type: RECTANGULAR. 3 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 6685-01-443-4032 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.