The Is A Phase Frequency Analyzer That Can Very Accurately Measure The Frequency And Phase Difference Between Signals Applied To Two Inputs. The Input Frequency Can Be Any Frequency Between 1 Mhz And 290 Mhz. Typical Use Is To Measure The Difference Between Two 10 Mhz Clocks. Can Display The Phase And Frequency Difference Digitally, Display The Measurement Results Versus Time As A Graph, Store The Measurement Results On An Sd Card Inserted Into The Sd Card Slot, Or Send The Phase Measurement Results To A Pc Via Usb And Run Programs Such As Timelab For Further Display And Processing. Phase And Frequency Measurement Accuracy Is 1 E-12 Per Second. Please Note That The Maximum Frequency Difference That Can Be Displayed Depends On The Measurement Time (Tau) And Is Approximately 200 Hz/S, So For A Tau Of 1 S, The Maximum Frequency Difference Is 200 Hz. Is A Portable Battery-Powered Device That Uses A Usb Interface To Charge And Has A 4-Inch Display, Making It Very Easy To Carry And Operate. Description: Function 1. is based on -H4 hardware and runs customized software to measure small deviations of two signals with close frequencies. If you already own -H4 and do not need for long-term measurement, you can use -H4 to flash the firmware without having to purchase it again. 2. The is not a frequency meter and the internal reference is inaccurate and unstable. It is only used to measure the deviation of two signals with close frequencies. Can be used to compare a signal to a very accurate reference signal. 3. The is not a phase noise analyzer. Material: ABS Color as shown Package Contents: 1 x Host (Including 4-Inch Touch Screen, 2000mAh Battery) 2 x 30cm SMA Male To Male ALSR100 RF Cable 1 x MicroSD Memory Card (Inserted Into The Host) 1 x MicroSD Card Reader 1 x USB Type- C Data Cable 1 x Touch Pick Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use 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.