Fangrui Product Details Faster Sampling Speed: Compared To The Previous 138pro Mini Oscilloscope, This Upgraded 154pro Mini Oscilloscope Has A Real-time Sampling Rate Of 40msa/s, A Bandwidth Of 18mhz, 500khz Signal Generator Frequency. Improve Your Work Efficiency. 2 Trigger Modes One-key Auto: The Diy Oscilloscope Kit Configured 2 Trigger Modes, Auto/normal. Support Waveform Parameter Setting,such As Time Base, Amplitude, Etc. And Support Waveform One-key Auto To Automatically Adapt To The Screen, No Need To Adjust Parameters,convenient And Accurate Measurement. There Are 14 Measurement Options Available: Frequency, P-eak To P-eak, Duty Cycle, Amplitude, Rms, Average, Period, +pulse Width, -pulse Width, Max, Min,top, Base. Built-in High Voltage Protection: The Handheld Oscilloscope Built-in High Voltage Protection Module Can Withstand Up To 400v Ac/dc Voltage Signal. And Built-in 1000m-ah High-quality Battery, Can Be Used Continuously For About 6 Hours After Full Charge. Wide Applications: For The Maintenance Industr