If were looking for a low cost handheld oscilloscope to measure the output signal of either a Legacy Base or TIU would this $25 one work??
New Assembled DSO150 2.4 inch LCD Display Digital Oscilloscope with Probe
eBay item number:
222948398748
OR
NEW ATTEN GRATTEN GA1102CAL 100MHz 2CH Digital Oscilloscope 7" LCD 1G Sa/s
This one is $300 but with what I spend on trains this $$ is not much of an issue.