Product Overview The PLJ-091OLED-L1 is a high-performance pen-style frequency counter featuring an OLED display. Compact and portable, it is designed for frequency measurement applications such as testing crystal oscillator accuracy in microcontroller systems and evaluating communication port timing reliability. : Studio SJ8K24P-T dedicated chip (100MHz capacity) Premium Build: Acrylic housing + 0.91" blue OLED display High- Reference: KDS -TCXO (2.5ppm stability) Advanced Algorithm: gate control with timing (non-interrupt driven) Dual Gate Times: 0.1s/1.0s selectable (10Hz/1Hz resolution) Smart Display Modes: MHz/kHz/Hz unit switching for optimal readability Dual Input Methods: Signal probeneedle or port (high sensitivity) Type-C Powered: 5V operation with low current consumption Auto Memory: Settings preserved after power cycle Operation Guide Gate Time Selection: button to toggle between 0.1s (faster refresh) and 1.0s (higher accuracy) Unit Display: Cycle through MHz/kHz/Hz modes for best reading format Note: Signals >100MHz show truncated display in MHz/kHz modes - use Hz mode for full resolution Input Options: Use needleprobe for direct IC testing Use port for cable connection Color: Black Material: plastic Package Contents: 1*PLJ-091OLED-L1 frequency counter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.