The item is a FNIRSI 2D15P, a 3-in-1 portable test tool combining a 2-channel digital oscilloscope, a true RMS multimeter, and a DDS function signal generator,Oscilloscope: Features a 100 MHz analog bandwidth (single-channel), a 500 MSa/s real-time sampling rate, and a 4.3-inch capacitive touchscreen display,Provides 19,999 counts of resolution for measuring AC/DC voltage, current, resistance, capacitance, diode, and continuity, Signal Generator: Capable of outputting 14 types of functional signals, including sine, square, and ramp waveforms, with a frequency up to 10 MHz, Convenience: The device includes a one-button "AUTO" feature for quick waveform adjustment and a 5000 mAh lithium battery with Type-C charging, this is the bast you can see in any store apply for it now very much available