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Check the listing for details. 400V Digital Oscilloscope Handheld Transistor Tester 500kMHz Bandwidth 10MS/s. Condition: New. Listed at 65.37 USD. Handheld Digital Oscilloscope is 3 functions of a digital oscilloscope, transistor tester, and signal generator in 1, a wide range of functions, very practical. DSO-TC3 Oscilloscope is a simple interface, easy to operate, with a non-slip recessed design and highly flexible keys, high-quality ABS drop-proof housing.