The Hygrothermograph, cataloged under National Stock Number 6685-00-641-3580, 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 Palmer Instruments Inc. Dba Palmer Instruments Inc. Government technical data includes 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-641-3580 |
| Primary Part Number | 6305X |
| Item Name | Hygrothermograph |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Palmer Instruments Inc. Dba Palmer Instruments Inc |
| Status | ACTIVE |
| Sensing Element Type | MERCURY VAPOR BULB |
| Measurement Type | SENSITIZED ACTUATING ELEMENT |
| Pointer/pen Type and Quantity | 2 INDICATING SINGLE |
| Case Type | ROUND |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | +30.0 TO 120.0 FAHRENHEIT DEGF |
| Material | GLASS BULB |
| Measurement Range | +30.0 TO 120.0 DEG FAHRENHEIT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6305X | Palmer Instruments Inc. Dba Palmer Instruments Inc (USA) |
| Reference | Meaning |
|---|---|
| MILP11768CLASS2 | 4/1 Identification reference U.S. Government activity |
| MH501020 | 5/1 Secondary reference Ever Ready Thermometer Co Inc |
| 580 | 3/2 Design control — primary reference U.S. Government activity |
| 314 | 5/9 Secondary reference Weksler Glass Thermometer Corp |
NSN 6685-00-641-3580 is a Hygrothermograph, manufactured by Palmer Instruments Inc. Dba Palmer Instruments Inc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-641-3580 has 1 manufacturer part number on file: 6305X (Palmer Instruments Inc. Dba Palmer Instruments Inc).
Key specifications for 6305X: Sensing Element Type: MERCURY VAPOR BULB; Overall Height: 0.500 INCHES NOMINAL IN; Measurement Type: SENSITIZED ACTUATING ELEMENT; Overall Length: 9.000 INCHES NOMINAL IN. 8 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.
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.