Amp Tronics designs Single Channel Handheld Digital Storage Oscilloscope. Amp Tronics also develops custom solutions based on advanced technologies which include silicon, embedded hardware and software to full system platforms. This Digital Storage Oscilloscope has 3.5 inches [640X480] colour TFT-LCD screen. The Single Channel Handheld Digital Storage Oscilloscope, Model HDS1021M, has external trigger. This Digital Storage Oscilloscope has maximum 6000 record length for each channel and auto-scale function. This Digital Storage Oscilloscope has waveform mathematic function and advanced trigger functions. This Digital Storage Oscilloscope has lithium battery for 6 hours operation time.