The Tachometer,vibrating Reed, cataloged under National Stock Number 6680-00-490-2878, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-00-490-2878 |
| Item Name | Tachometer,vibrating Reed |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Status | ACTIVE |
| FSC Application Data | T.O. 33A1-11-1-101; DIRECT INDICATING VIBRATION PICK UP ASSEMBLY, A COMPACT MECHANICAL INSTRUMENT DESIGNED FOR CHECKING AIRCRAFT PROPELLER SPEEDS AND FOR PERFORMING APPROXIMATE VIBRATION ANALYSIS |
| Design Type | SINGLE REED |
| Measurement Range in RPM | +800.0 TO 2600.0 |
| Case Shape | RECTANGULAR |
| Carrying Case | PROVIDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 43D13835 | 3/9 Design control — primary reference U.S. Government activity |
NSN 6680-00-490-2878 is a Tachometer,vibrating Reed, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
Key specifications for 6680-00-490-2878: FSC Application Data: T.O. 33A1-11-1-101; DIRECT INDICATING VIBRATION PICK UP ASSEMBLY, A COMPACT MECHANICAL INSTRUMENT DESIGNED FOR CHECKING AIRCRAFT PROPELLER SPEEDS AND FOR PERFORMING APPROXIMATE VIBRATION ANALYSIS; Design Type: SINGLE REED; Measurement Range in RPM: +800.0 TO 2600.0; Special Features: DIMENSIONS: HEIGHT 2 INCHES, WIDTH 2 INCHES, DEPTH 6.5 INCHES; SPEED INDICATION ACCURACY +/- 2%; CONSISTS OF A VIBRATING REED, THE LENGTH OF WHICH IS ADJUSTED BY A TURNING SCREW; REED MOVES ACROSS THE FACE OF A CALIBRATED HOUSING PLATE TO GIVE VIBRATION AMPLITUDE WHILE THE POSITION OF THE SCREW HOLDER GIVES AN INDICATION OF VIBRATION FREQUENCY CALIBRATED IN RPM; INCLUDES WOODEN CARRYING CASE IN. 5 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.