Keysight technologies u1600 series handheld oscilloscopes with multimeter keysight technologies u1604b opt 001 abd 954 the keysight technologies u1604b is a handheld digital 40mhz dual channel oscilloscope which includes digital multimeter functions extended trigger functions this u1604b 001 version is supplied with a usb host capability to allow connection to an external memory keysight technologies u1604b 001 handheld oscilloscope with multimeter 40 mhz