The Hygrothermograph, cataloged under National Stock Number 6685-01-022-0777, 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 Bacharach, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-022-0777 |
| Primary Part Number | 35556-106 |
| Item Name | Hygrothermograph |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Bacharach, Inc. |
| Status | ACTIVE |
| Recording Chart Type | CONTINUOUS STRIP |
| Measurement Type | SENSITIZED ACTUATING ELEMENT |
| Functional Description | COMBINES BOTH SENSITIVE HUMIDITY AND TEMPERATURE ELEMENTS; 6 INCH STRIPCHART GIVEN CONTINUOUS GRAPH OF AMBIENT TEMP. AND RELATIVE HUMIDITY IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 6685-01-022-0777 is a Hygrothermograph, manufactured by Bacharach, Inc., classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-022-0777 has 2 manufacturer part numbers on file: 35556-106 (Bacharach, Inc.), 22-7009 (Bacharach, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-421-7714. Verify interchangeability with system specifications before substitution.
Key specifications for 35556-106: Recording Chart Type: CONTINUOUS STRIP; Measurement Type: SENSITIZED ACTUATING ELEMENT; Special Features: UPPER HALF OF CHART RECORDS -32 DEG F TO +130 DEG F TEMP.; LOWER HALF RECORDS 15% TO 95% R.H.; CHART DIVISIONREPRESENTS 2% RH OR 2 DEG F (24 HR) AND 5% RH OR 5 DEG F (7 DAY); INCLUDES 100 CHARTS, PURPLE AND RED INKS; EXTRA 24 HR STRIPS P/N 35556-139; EXTRA 7 DAY CHART STRIPS P/N 35556-150; HUMIDITYRANGE 0-100% RH; TEMP RANGE 0-100 DEG F DEGF; Functional Description: COMBINES BOTH SENSITIVE HUMIDITY AND TEMPERATURE ELEMENTS; 6 INCH STRIPCHART GIVEN CONTINUOUS GRAPH OF AMBIENT TEMP. AND RELATIVE HUMIDITY IN. 3 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.