Hantek 2C42 Digital Oscilloscope Multimeter USB Portable 2 Channels 40MHz 250MSa/s Multifunction Tester: Amazon.com: Industrial & Scientific
GW Instek GDS-1054B Digital Storage Oscilloscope, 4-Channel, 1 GSa/s Maximum Sampling Rate, 50 MHz, 10M Maximum Memory Depth for Each Channel: Amazon.com: Industrial & Scientific