If buying locally, perform these checks to verify functionality:
Test all knobs and buttons. Rotary encoders (the knobs on DSOs) are common failure points; ensure they don't skip or lag. buy used oscilloscope
Deeper memory allows you to capture longer time windows while maintaining a high sample rate, which is crucial for finding intermittent glitches. If buying locally, perform these checks to verify
Check for dead pixels on LCDs or "screen burn" on older analog CRT displays. Top Used Models for Hobbyists (2026) Based on current market availability and community favor: Check for dead pixels on LCDs or "screen
Connect a probe to every channel and attach it to the built-in probe compensation output (usually a small metal tab on the front). You should see a clean, steady square wave.
This determines the highest frequency signal you can measure. For general hobbyist work, aim for at least 50–100 MHz .