Features Wide Range of Applications: DSO FNIRSI PRO is a high-performance and cost-effective handheld oscilloscope. The digital oscilloscope is applicable to many fields, such as electronic production, home appliance maintenance, automobile maintenance, equipment commissioning, scientific research and education, product development, etc. High‑definition LCD Screen: The display is equipped with a 2.4‑inch 320 x 240 resolution high‑definition LCD screen, extremely convenient waveform storage function, built‑in 16MB storage space, can store up to 500 waveform pictures. Features: Powerful waving file manager, supports thumbnail browsing, viewing, detailed information viewing, flipping, deleting and other functions. The built-in 1200mAh rechargeable lithium battery can be charged continuously for 3 hours at a time. The day mode and night mode can be changed according to your preferences. Matters Needing Attention: 1X measurement voltage is 0~40V, 10X measurement voltage is 40~800V, to adjust to the 1X position, both the probe and the oscilloscope must be set to 1X mode, and to adjust to the 10X position, both the probe and the oscilloscope must be set to 10X mode. Real-time Sampling Rate: The oscilloscope has a real-time sampling rate of up to 20MS/s and an analog bandwidth of 5MHz. If the probe switch is moved to the 10X position and the oscilloscope is in the 1x position, the oscilloscope will not burn, but the measured data is abnormal. Specification: Item Type: Digital Oscilloscope Product Material: ABS Product Model: DSO FNIRSI PRO Number of Channels: 1 Screen Size: Approx. 6.1cm / 2.4in Screen Resolution: 320 x 240 Display: LCD screen Analog Bandwidth: 5MHz Maximum Sampling Rate: 20MSps Trigger Mode: Single/normal/auto Waveform Storage: 500 Built-in Battery: Lithium battery 1200mAh Standby Time: 3 hours Charging: 5V/1A/2A/3A/4A Package List: 1 x Matching Probe 1 x Oscilloscope 1 x User Manual  1 x Data Line Package List