OLED Pen Frequency Meter 200Hz–100MHz | High-Precision RF Counter
OLED Pen Frequency Meter 200Hz–100MHz | High-Precision RF Counter
200Hz–100MHz Pen-Type Frequency Meter with 0.91" OLED Display
The PLJ-091OLED-L1 Frequency Meter Pen is a compact, high-precision RF frequency counter built for electronics engineers, hobbyists, and radio enthusiasts who demand accurate, real-time frequency readings. Featuring a crisp 0.91-inch blue OLED screen and a dedicated SJ8K24P-T measurement chip, this pen-style instrument delivers measurement accuracy down to 1Hz across a wide range of 200Hz to 100MHz — making it an indispensable tool for RF testing, MCU oscillator verification, and wireless device calibration.
Made in Mainland China.
Key Features
- High-Precision Dedicated Chip: The SJ8K24P-T chip delivers measurement accuracy of 10Hz or 1Hz, ensuring stable and reliable performance across all supported frequencies.
- Temperature-Compensated Crystal Oscillator (TCXO): A built-in ±2.5ppm TCXO ensures excellent frequency stability, making this meter suitable for precise, professional-grade frequency measurement.
- 0.91" Blue OLED Display: Bright, high-contrast display shows up to 8 digits for clear, real-time frequency readings — even in low-light environments.
- Switchable Unit Display: Instantly toggle between MHz, KHz, and Hz display modes with the K2 key for fast identification of frequency values.
- Compact Acrylic Shell: Pen-form factor with high signal sensitivity makes this meter easy to carry and ideal for on-site high-frequency detection.
- Auto Memory: All user settings are saved automatically when powered off and restored instantly on startup — no reconfiguration required.
- USB Type-C Power Interface: Modern, reversible Type-C connector for easy, reliable power connection (DC 4.5–5.5V; 5V recommended).
Technical Specifications
| Measurement Range | 200Hz – 100MHz |
| Measurement Accuracy | 10Hz / 1Hz |
| Frequency Stability | ±2.5ppm |
| Gate Time | 0.1s / 1.0s |
| Power Supply | DC 4.5–5.5V (5V recommended) |
| Operating Current | ~30mA at 5V DC |
| Display | 0.91-inch OLED (up to 8 digits) |
| Interface | USB Type-C |
| Shell Material | Acrylic |
Ideal Applications
- Verifying and calibrating crystal oscillators in MCU / single-chip microcomputer systems
- Testing and evaluating wireless communication equipment and radio transceivers
- Calibrating signal and frequency generators
- Evaluating communication port output timing reliability
- General RF signal measurement and troubleshooting in the field
Important Usage Notes
- The signal ground connection uses only the shielding layer of the shielded wire — the inner core is not connected to ground.
- Do not use fast-charging adapters, as they may output voltages higher than 5V and could damage the device.
- When a signal exceeds 100MHz in MHz or KHz display mode, the leading digit "1" may not display. Switch to Hz mode (press K2) for a full readout.
- Color may vary slightly from product images due to display and lighting differences. Dimensions allow ±1mm–1cm variance due to manual measurement.
What's in the Box
- 1× Frequency Meter Pen (PLJ-091OLED-L1)
For further reference on RF measurement standards and electronic test equipment safety, visit the National Institute of Standards and Technology (NIST) – Electrical Measurements.
Frequently Asked Questions
Q: What is the measurement range of this RF frequency meter pen?
A: This frequency counter measures signals from 200Hz up to 100MHz, covering a wide range of RF and digital signals used in radio transceivers, MCU oscillators, and communication equipment.
Q: What power supply does the frequency meter pen require?
A: The device operates on DC 4.5–5.5V via a USB Type-C interface. A standard 5V USB power supply is recommended. Do not use fast-charging adapters, as they may output voltages that exceed the safe operating range.
Q: Why doesn't the display show all digits when measuring above 100MHz?
A: The 0.91-inch OLED screen supports up to 8 digits. When the measured frequency exceeds 100MHz in MHz or KHz display mode, the leading digit "1" may be cut off. Simply press the K2 key to switch the display unit to Hz for a complete, full-digit readout.
Q: Does the device retain my settings after being powered off?
A: Yes. The frequency meter pen features automatic settings memory. All configurations — including display unit preference and gate time — are saved automatically when the device is powered off and restored immediately upon startup.
Q: Is this frequency counter suitable for testing radio transceivers?
A: Absolutely. The ±2.5ppm temperature-compensated crystal oscillator and 1Hz measurement accuracy make this meter well-suited for testing and calibrating radio transceivers, verifying oscillator frequencies, and evaluating RF signal sources across the 200Hz–100MHz range.