The Hygrometer,digital, cataloged under National Stock Number 6685-01-676-3531, 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 Rix Industries. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-676-3531 |
| Primary Part Number | 138-24786 |
| Item Name | Hygrometer,digital |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Rix Industries |
| Status | ACTIVE |
| Sensing Element Type | BIMETALLIC TEMP |
| Display Digit Quantity | 5 |
| Scale Calibration | SUPPLIED WITH CERTIFICATE OF CALIBRATION TRACEABLE TO NATIONAL PHYSICS LABORATORY (NPL).; FIELD CALIBRATION / SPAN CHECK FACILITY. ACTIVATED AND OPERATED VIA POTENTIOMETER ON THE FRONT OF THE INSTRUMENT. |
| Scale Accuracy Rating | ACCURACY +2 DEGREE C (3.6 DEGREE F) DEWPOINT |
| Measurement Type | DIGITAL |
| Style Designator | PANEL MOUNTED |
| Display Type | LIGHT EMITTING DIODE (L.E.D.). |
| Operating Temp Range | -20.0 TO 60.0 CELSIUS DEGC |
| Material | PLASTIC METER CASE |
| Switch Type and Quantity | 4 PUSH BUTTON |
| Measurement Range | -100.0 TO 20.0 DEG CELSIUS AND -148.0 TO 68.0 DEG FAHRENHEIT AND +0.0 TO 95.0 PERCENT RELATIVE HUMIDITY |
| Voltage Rating in Volts | 90.0 AC MINIMUM AND 250.0 AC MAXIMUM |
| 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 |
|---|---|
| SUPERDEW 3 P-C-AC | Shaw Moisture Meters (uk) Ltd (GBR) |
| 138-24786 PRIMARY | Rix Industries (USA) |
| MODEL SD3-P | Air & Liquid Systems, Inc. (USA) |
NSN 6685-01-676-3531 is a Hygrometer,digital, manufactured by Rix Industries, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-676-3531 has 3 manufacturer part numbers on file: SUPERDEW 3 P-C-AC (Shaw Moisture Meters (uk) Ltd), 138-24786 (Rix Industries), MODEL SD3-P (Air & Liquid Systems, Inc.).
Key specifications for 138-24786: Sensing Element Type: BIMETALLIC TEMP; Overall Height: 72.0 MILLIMETERS NOMINAL MM; Display Digit Quantity: 5; Scale Calibration: SUPPLIED WITH CERTIFICATE OF CALIBRATION TRACEABLE TO NATIONAL PHYSICS LABORATORY (NPL).; FIELD CALIBRATION / SPAN CHECK FACILITY. ACTIVATED AND OPERATED VIA POTENTIOMETER ON THE FRONT OF THE INSTRUMENT.. 12 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.