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 Gate Control Method And Precise Time Algorithm (Non-Timed Interruption Method). 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. Working Voltage: Dc Input:Dc 9v-15v (With Power Polarity Reverse Protection) Working Current: Maximum 160 Ma (Test Conditions: ① Dc12v Power Supply; ② Red Digital Tube; ③ 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 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 Not Affect The Use Frequency:24MHz Type:B:Yellow Light Colour:As Shown Material:PCB Package Contents: 1 * Frequency Meter Module 2 Sets * Wiring Harnesses 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.