In the field of optical communication testing, every improvement in accuracy and efficiency translates to lower project risks and greater confidence in decision-making.JILONG officially launches its 4.3-inch premium instrument series, delivering a new-generation measurement experience for optical fiber link acceptance and optical cable construction.

This newly released 4.3-inch premium instrument series lineup consists of five models: OLS‑33, OPM‑33 (V), OPM‑33P, OVA‑33 and FOT‑33. New products including the GOPN optical power meter will be launched successively in the future.

I. Inheritance & Innovation: Design Philosophy of High‑End Instruments

Previous‑generation products of this series, such as the OPM-22 and OLS-22, have won wide user recognition for their compact portability and reliable performance. Innovation never stops, and progress knows no bounds. In close collaboration with field technicians, the JILONG R&D team collected feedback from actual users and diverse application requirements. Leveraging cutting-edge research findings and advanced technologies, the team upgraded hardware configurations and launched the 4.3-inch premium instrument family. Targeting solving operational pain points, this new product series features comprehensive upgrades in hardware, touchscreen design, battery capacity and more. With overall user experience improvements, the new lineup is poised to become another benchmark star product of JILONG in the market.

II. Unmatched Core Performance

(1) Optical Light Source OLS-33

As an essential basic testing instrument, the optical light source is widely used in optical link testing, fiber optic sensing, optical cable construction and operation & maintenance. The OLS-33 delivers a standard reference optical power output of 0 dBm with outstanding long-term stability, suitable for engineering link loss testing, cabling acceptance and on-site optical power meter calibration. It boasts superior stability: output deviation is controlled within ±0.05 dB over 15 minutes, and only ±0.2 dB over an 8-hour continuous operation.

(2) Optical Power Meter OPM‑33(V)

Alongside optical light sources, optical power meters are core measuring devices for daily optical communication operation and maintenance. The OPM-33 is pre-calibrated for 9 test wavelengths to meet diverse engineering testing demands. Equipped with a large-size 1000 μm fiber receiving surface, it greatly improves optical reception efficiency and reduces alignment difficulty. It features power stability of around 0.1 dB and a measurement accuracy of ±0.2 dB.The OPM-33V Optical Power Meter & Visual Fault Locator integrates a red light source function for quick fiber break detection.

(3) Optical Attenuator OVA‑33

Responding to user application demands and industry trends, JILONG newly launches the OVA-33 optical attenuator. With a maximum attenuation range of up to 80 dB, it adapts to ultra-long-haul trunk lines, multi-stage PON optical splitting and aged high-loss links. It achieves an attenuation error as low as 0.2 dB and supports customized calibrated wavelength configurations for versatile professional testing scenarios.

(4) Optical Multimeter FOT‑33

Integrating an optical light source and an optical power meter in one unit, the FOT-33 doubles work efficiency and enables single-person fiber loss testing. Consistent optical path calibration delivers higher precision and richer functions, significantly boosting efficiency in cabling maintenance and project acceptance. The optical power meter module supports 9 calibrated wavelengths covering most application scenarios, with a measurement range down to −70 dBm and power stability of ±0.1 dB. Its optical light source module provides steady output with a 0.05 dB fluctuation over 15 minutes and 0.2 dB over 8 hours.

(5) WDM Power Meter OPM‑33P

According to MIIT reports, more than 31 million 10G PON ports have been deployed across China by the end of 2025, covering 238 million gigabit-capable users. 10G PON has entered wide-scale commercial deployment. Conventional optical power meters cannot distinguish single-wavelength signals, easily causing fault misjudgments, making professional wavelength-selective power meters an essential tool.

Tailored for PON networks, the JILONG OPM-33P is calibrated for wavelengths of 1310nm, 1490nm, 1270nm and 1577nm, compatible with GPON and 10G PON scenarios. Building on standard optical power meter functions, it adopts filter isolation technology with isolation above 35 dB and a narrow-band spectral passband of 1270–1520nm. It effectively separates 1490nm and 1550nm signals, eliminates wavelength crosstalk and prevents measurement deviations.

See attached parameter table, scroll horizontally for full view

III. Comprehensive Hardware & Software Upgrades

In terms of hardware, the 4.3-inch premium instrument series features all-round upgrades including expanded calibrated wavelength ranges, high-definition touchscreens, larger battery capacity and optimized appearance.

Calibrated wavelength coverage is extended to support broadband, PON, 5G and WDM full-scenario applications. All new models are equipped with a 4.3-inch capacitive touchscreen, enabling one-finger efficient operation instead of traditional button control—simplifying workflows with technological innovation. Battery capacity is upgraded to 5000mAh for extended working hours. In addition, all units come standard with an RJ45 network sequencing function for one-click line sequencing via network cable. Full-body shock-resistant rubber casing improves drop resistance and service life.

For user experience, the series optimizes usability, reliability and compatibility with humanized designs tailored to user needs.

For ease of use: automatic power-off after 10 minutes of inactivity saves power and protects the battery and device. The OPM-33V, FOT-33 and OPM-33P support one-click data storage for around 1000 records, which can be exported via USB port. For reliability: each unit undergoes standardized environmental performance and calibration tests before delivery to ensure the quality. For compatibility: replaceable universal connectors are standard, allowing quick adapter swaps to cope with mixed on-site connector types.

IV. Order Information

Availability: Orders are accepted with immediate effect, shipped in order of placement.

Measurement conquers uncertainty; precision eliminates errors.The JILONG 4.3-inch premium instrument family ensures reliable performance for every test.