The Phorometer,ophthalmic, cataloged under National Stock Number 6540-01-421-5795, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. The manufacturer of record is Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 6540-01-421-5795 |
| Primary Part Number | RT-300 |
| Item Name | Phorometer,ophthalmic |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Unit of Issue | EA |
| Part Number | Manufacturer |
|---|---|
| RT-300 PRIMARY | Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart (USA) |
| Reference | Meaning |
|---|---|
| LLH392191 | 5/1 Secondary reference Naval Medical Material Support Command Detachment |
| NAVY 1993 2373 | 5/1 Secondary reference U.S. Government activity |
NSN 6540-01-421-5795 is a Phorometer,ophthalmic, manufactured by Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-01-421-5795 has 1 manufacturer part number on file: RT-300 (Lombart Brothers, Inc Dba Marco Lombart Div Marco Lombart).
1 possible match (shared part number, not a government interchangeability claim): 3940-01-433-0858. Verify interchangeability with system specifications before substitution.
Key specifications for RT-300: Part Name Assigned by Controlling Agency: PHOROMETER OPHTHALM. 0 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.