FNIRSI-138PRO Digital Oscilloscope Support AUTO 80Khz PWM Firmware Update 2.5MSa/s 200KHz Analog Bandwidth PWM Square Wave Output            Description     FNIRSI-138 PRO is a highly practical and cost-effective MINI handheld oscilloscope launched by FNIRSI, which is aimed at the maintenance industry and the R&D education industry.            Feature     1.The oscilloscope has a real-time sampling rate of 2.5MS/s and a 200KHz bandwidth. 2.With full trigger function (single, normal, automatic), 3.Works perfectly for both periodic analog signals and aperiodic digital signals. 4.Voltages up to ±400V can be measured. 5.Equipped with efficient one-key AUTO, the measured waveform can be displayed without cumbersome adjustment. 6.The display is equipped with a 2.4-inch high-definition LCD screen with a resolution of 320*240. 7.Built-in 1250mah high-quality lithium battery, a full charge can be used continuously for about 5 hours.            Specification     Material: PCB Type:(optional) Type1: without 10x Probe, without battery Type2: without 10x Probe, with battery Type3: with 10x Probe, without battery Type4: with 10x Probe, with battery Sampling rate: 2.5MS/s bandwidth: 200KHz Voltage ranges: X1: ±40V(Vpp:80V) X10: ±400V(Vpp:800V) (only type3&4) Trigger modes: Single, Automatic, Normal Coupled mode: AC/Direct current PWM output: 3.3V Frequency: 0-80kHz Duty cycle: 0-100%            Packing list:     Type1&2 package include: 1 * Oscilloscope Type 3&4 package include: 1 * Oscilloscope 1 * 10x Probe