Optical power meter + VFL + RJ45 cable tester
Quick answer: shortlist Y9 when one configurable tool for basic fiber and RJ45 troubleshooting matters and the supplier will identify the exact configuration in writing. Shortlist the Jonard FPM-50S when a lighter unit with one clearer published specification matters more. Neither has been bench tested by Fiber Tool Lab.
Consider it when: basic optical power checks, visual fault finding, and RJ45 wire-sequence checks belong in the same service visit.
Do not choose on the model name alone: range, VFL output, battery, adapters, 4G, and phone operation vary or are optional in the manual.
Consider it when: a published −50 to +26 dBm range, ten calibrated wavelengths, 2 mW VFL, RJ45 tester, low weight, and long stated runtime fit the job.
Confirm before ordering: Jonard's current page conflicts on whether two or three AAA batteries are associated with the unit.
Skip both as a complete solution when: the job requires certified loss testing, an OTDR trace, connector inspection, Ethernet qualification, or traceable calibration.
A multi-function meter can speed triage; it does not turn every included function into a certification instrument.
These are procurement inferences from official public documentation, not performance rankings or purchase guarantees.
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| Buying question | Guangyan Y9 manual | Guangyan English catalog | Jonard FPM-50S official page |
|---|---|---|---|
| Core functions | Optical power meter, VFL, RJ45 cable-sequence test; data storage and frequency recognition; optional 4G and phone operation. | “4 in 1” all-in-one Mini OPM with VFL and RJ45 cable tester; the fourth function is not clearly named in the listing title. | Absolute or relative optical power, built-in VFL, and RJ45 network-cable test with remote. |
| Power-meter range | 800–1700 nm detector range. Selectable measurement ranges: −70 to +6, −70 to +10, or −50 to +26 dBm. | No range in the catalog title. | 800–1650 nm stated coverage; −50 to +26 dBm measurement range. |
| Calibrated / standard wavelengths | 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, and 1625 nm. | Not stated in the catalog title. | 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, and 1650 nm. |
| Published uncertainty | ±5%; the manual does not state enough conditions to compare this directly with Jonard's dB figure. | Not stated in the catalog title. | The calibrated-wavelength specification line states ≤ ±0.2 dB. |
| VFL | 650 nm; 5, 15, 20, or 30 mW selectable options. | Title states 1 mW. | Built-in 2 mW VFL. |
| Storage and runtime | 100 records, 10-minute auto-off, and 20-hour battery operation; the rechargeable battery is described as optional. | Not stated in the catalog title. | 10-minute auto-off and ≥120 hours published operating time. |
| Size and weight | 142 × 73 × 31 mm; 375–455 g depending on configuration. | Not stated in the catalog title. | 101.6 × 50.8 × 25.4 mm; 136.2 g. |
The Y9's strongest public-source case is configuration breadth: three power-meter ranges, four stated VFL power options, several power-supply choices, and optional mobile connectivity around one fiber-and-copper troubleshooting workflow. That can suit distributors, private-label projects, and field teams that want a configuration matched to their market.
The same flexibility is also its biggest procurement weakness. A broad family is useful only when the quotation, sample, manual, label, invoice, and delivered unit all describe the same build.
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| Get this in writing | Acceptable evidence before a sample order | Why it matters |
|---|---|---|
| Model and option code | One SKU or option matrix tied to the quotation. | “Y9” alone does not identify one fixed build. |
| OPM configuration | Range, nine wavelength settings, detector, resolution, and uncertainty conditions. | Prevents the wrong range or unsupported accuracy expectation. |
| VFL configuration | Measured nominal output, mode, connector, and safety class for the ordered unit. | Public sources disagree between 1 mW and 5–30 mW options. |
| Included hardware | Photos and list covering adapters, RJ45 remote, batteries, charger, cable, and case. | The manual marks several power items optional. |
| Mobile features | App name, supported phones, privacy terms, 4G module, cloud dependency, and export format. | 4G and phone operation are optional, not baseline functions. |
| Quality and support | Serial-numbered calibration record, warranty period, DOA policy, repair route, and spare-unit terms. | A low purchase price is not useful if the after-sales path is undefined. |
Request the Y9 evidence checklist Request a Y9 bench comparison
The official Y9 manual documents optical power measurement, a 650 nm visual fault locator, and RJ45 cable-sequence testing. It also lists data storage, frequency recognition, and optional 4G or phone operation.
It may reduce the number of tools carried for basic fault finding, power checks, and RJ45 continuity work. It does not replace a calibrated light source, certification tester, OTDR, connector inspection scope, or independently calibrated reference meter when those jobs are required.
Both public descriptions combine an optical power meter, VFL, and RJ45 tester. Jonard publishes one clearer FPM-50S specification, while the Y9 manual presents selectable ranges, VFL powers, power supplies, and optional mobile functions that must be fixed in writing before purchase.
Confirm the exact model or SKU, optical power range, VFL output, connector and adapter package, RJ45 remote, battery, 4G or phone option, calibration evidence, warranty, and repair terms.
Comparable public unit-sales figures were not found. Jonard is used as an established overseas reference with current official documentation, not as a verified sales leader.
Sources accessed July 21, 2026. Confirm current availability, orderable configuration, certification, and local support directly with the supplier or manufacturer.