K-535 multi-function optical power meter in yellow, display showing 1550 nm, with VFL key and RJ45 sequence LEDs

OTDR & Test Instruments

K-535 Multi-Function Optical Power Meter with VFL

Four instruments in one hand: power meter, red-light fault locator, RJ45 cable sequencer and work light — one rechargeable unit for the whole FTTH visit.

Measurement range: -70 to +6 dBm or -50 to +26 dBm (two versions)
Standard wavelengths: 850 / 980 / 1300 / 1310 / 1490 / 1550 / 1625 nm
Wavelength range: 800–1700 nm
Detector: InGaAs
Uncertainty: ±0.15 dB

-70 to +6 dBm version-50 to +26 dBm version

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Key features

Four jobs, one instrument: the power meter reads the level, the built-in red light proves the fiber, the RJ45 tester checks the LAN run, and the LED lights the cabinet — the technician carries one unit up the pole or into the plant room, not a bag of single-purpose testers
Two range versions cover both ends of the work: -70 to +6 dBm for loss-heavy FTTH drops after big splitters, and -50 to +26 dBm for transmitter-side and CATV levels that would saturate a sensitive meter
The VFL is a real locator, not a token LED: 650 nm at 2, 10 or 30 mW as ordered, steady or blinking, so a break glows through the jacket at the splice tray and a macro-bend shows itself along the drop
Seven standard wavelengths (850–1625 nm) with wavelength memory — the meter wakes on the wavelength you used last, and the screen shows wavelength, nW and dBm together, so linear and logarithmic readings never need mode-hopping
Honest field numbers: ±0.15 dB uncertainty, user calibration and user zeroing, so a crew can keep the unit true against its own reference source and record readings that stand up at acceptance
Rechargeable lithium power with over 120 hours of working time and USB charging from a laptop or power bank — no AA stock to manage, and the flip-out stand props the meter on the cabinet shelf while both hands work the patch field
Private labeling made to your requirements — labels with your logo, part numbers and barcodes on the inner boxes and outer cartons, ready for your warehouse

Specifications

Measurement range	-70 to +6 dBm or -50 to +26 dBm (two versions)
Standard wavelengths	850 / 980 / 1300 / 1310 / 1490 / 1550 / 1625 nm
Wavelength range	800–1700 nm
Detector	InGaAs
Uncertainty	±0.15 dB
Display resolution	0.01 dBm
Display	Wavelength, linear power (nW) and dBm shown together; wavelength memory; backlight with auto-off
VFL (red light source)	650 nm; output 10 / 20 / 30 mW as ordered; steady-on and blink modes
RJ45 test	Cable sequence check with 1–8 indicator LEDs
Lighting	Built-in LED work light for dark cabinets and closures
Functions	User calibration and user zeroing; auto power-off after 10 min
Connector	SC / FC / ST interfaces
Power supply	Rechargeable lithium battery (USB charging); working time over 120 h
Operating temperature	-10 °C to +60 °C
Storage temperature	-25 °C to +70 °C
Dimensions	118 × 72 × 32 mm
Weight	150 g
Housing colours	Yellow or blue

Where it works

FTTH installation and activation: check the ONT level, then prove the drop with the built-in red light — one instrument, no swapping tools
Cable construction and maintenance rounds where power, continuity and a work light are all needed in closures and cabinets
Verifying structured cabling on the same visit: the RJ45 sequence test catches split pairs and crossed cores in the LAN run
Optical CATV and sensing networks: wide-range power readings with user calibration and zeroing for repeatable records
Fault tickets after dark or in unlit plant rooms — the light, the meter and the locator are already in your hand