The Psychrometer, cataloged under National Stock Number 6660-00-640-9162, is classified within Federal Supply Class 6660 (Meteorological Instruments and Apparatus) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ashcroft Inc Dba Heise. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6660-00-640-9162 |
| Primary Part Number | ML224 |
| Item Name | Psychrometer |
| FSC / FSG | 6660 / 66 — Meteorological Instruments and Apparatus |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Handle Type | SWIVEL |
| Engraved Thermometer Stem | NOT INCLUDED |
| Mounting Panel Tables | NOT PROVIDED |
| Sling Handle | INCLUDED |
| Mounting Method | BACKPLATE THERMOMETER |
| Circulation Method | HAND SLING |
| Calibration Accuracy Rating | DEG C 0.2 FROM 0 DEG TO 63 DEG 0.3 FROM 0 DEG TO MINUS 12 DEG |
| Graduation Interval | 1.0 DEG |
| Operating Temp Range | -12.0 TO 63.0 CELSIUS DEGC |
| Thermometer Quantity | 2 |
| Mounting Shelter | NOT INCLUDED |
| Magnifying Lens | NOT INCLUDED |
| Material | WOOD LOCATION NOT OTHERWISE SPECIFIED |
| Material | STEEL CORROSION RESISTING THERMOMETER MOUNTING |
| Circulation Type | FORCED |
| Thermometer Filling Type | MERCURY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| ML224 PRIMARY | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| MILP11191 | 4/1 Identification reference U.S. Government activity |
| 2800-3-4-6 | 5/2 Secondary reference U.S. Government activity |
NSN 6660-00-640-9162 is a Psychrometer, manufactured by Ashcroft Inc Dba Heise, classified under FSC 6660, Meteorological Instruments and Apparatus. Status: active.
NSN 6660-00-640-9162 has 1 manufacturer part number on file: ML224 (Ashcroft Inc Dba Heise).
Key specifications for ML224: Handle Type: SWIVEL; Engraved Thermometer Stem: NOT INCLUDED; Overall Height: 0.485 INCHES NOMINAL IN; Mounting Panel Tables: NOT PROVIDED. 16 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.