2.4 Ghz Frequency Meter With Pic16f648a As The Core. The Frequency Reference Uses A Temperature Compensated Voltage Controlled Crystal Oscillator (2.5 Ppm -Tcxo). Adopt A Unique Gate Control And Precise Time Algorithm (Non-Timed Interruption ). The Gate (Display Refresh) Time Is Optional From 0.01 Second/0.1 Second/1.0 Second, And The Frequency Value Is Displayed In Real Time. Single-Ended Input Design, Three Channels Of Frequency Measurement (Low Channel/High Channel/Auto Channel) Are Optional. Dual If Design, If Value And Plus/Minus Mode Can Be Preset Independently. Adopts Eight-Digit 0.56-Inch High-Brightness Digital Tube Display With Eight-Level Brightness Adjustable. Invalid Zeros Are Automatically Blanked, Invalid Frequency Value Display Filtering Is Optional, And Last Bit Blanking Is Optional. Simple Circuit, Reasonable Structure, Double Button Control, Simple Operation.<br><br>Working Voltage: Dc Input:Dc 9v-15v (With Power Polarity Reverse Protection) Working Current: Maximum 160 Ma (Test Conditions: Dc12v Power Supply; Red Digital Tube; Eight Levels Of Brightness) Display Digits: Eight-Digit Led Display, Up To Eight Digits Can Be Displayed. Display Brightness: Eight Levels Of Led Brightness Are Adjustable, And The Factory Setting Is The Highest Brightness. Onboard Interface: Dc In (Power Interface):Hx2.54-2p Socket Rf In (Signal Input):Hx2.54-2p Socket Icsp (Programming Interface):2.54-6p Pin Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Frequency:12MHz Type:D:Blue Light Colour:As Shown Material:PCB<br><br>Package Contents: 1 * Frequency Meter Module 2 Sets * Wiring Harnesses<br><br>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.