The moment a maker project gets complicated enough that "it should work — why does it not?" becomes a weekly question, a logic analyzer or a small oscilloscope pays for itself in a single Saturday.
The good news: the floor on this category has collapsed. A usable logic analyzer is fifteen dollars. A respectable benchtop scope is under three hundred. These six are the picks we hand to customers stepping up from a multimeter to a real signal-analysis tool.
Logic analyzer or oscilloscope?
A logic analyzer answers "what bytes are flowing on this bus?" An oscilloscope answers "what does this voltage look like over time?" If you are debugging I²C, SPI, or UART, start with a logic analyzer. If you are looking at PWM, motor noise, or audio, start with a scope. Most makers eventually own one of each.
1. HiLetgo USB Logic Analyzer (8-channel, 24 MHz)
The fifteen-dollar Saleae clone. Eight channels, 24 MHz sample rate, works with the free PulseView and (with old drivers) Saleae Logic 1.x.
Best for: Best as the first logic analyzer for an Arduino or ESP32 hobbyist. Reading I²C, SPI, and UART becomes a one-cable job.
Watch out for: Not a current product Saleae supports. Fine for hobby — do not deploy in a lab where you need calibration certificates.
2. Saleae Logic 8 (Black)
The benchmark professional logic analyzer. Eight channels, 100 MS/s digital sampling, software that nobody complains about.
Best for: Best for serious embedded work — anyone debugging a custom protocol or a sensor chain professionally.
Watch out for: Costs ten to twenty times the clone. Worth it if you bill for debugging time; overkill for a hobby.
3. FNIRSI 1014D Dual-Channel Oscilloscope
Tablet-style benchtop scope with 100 MHz bandwidth, 1 GS/s sample rate, and a built-in 25 MHz signal generator. Real scope, real cheap.
Best for: Best as the first real scope for a hobby bench. Looks at PWM, debounce, and motor-driver waveforms without breaking the bank.
Watch out for: Probes that ship in the box are budget-grade. Plan to swap them for a proper x10 set if you care about accuracy at higher frequencies.
4. Hantek 6022BE PC USB Oscilloscope
Two-channel USB scope that streams to your laptop. 20 MHz bandwidth, 48 MS/s — fine for audio, low-speed digital, and Arduino-era signals.
Best for: Best as a backup scope, a travel scope, or a teaching tool when a laptop is already part of the workflow.
Watch out for: Software is dated. The open-source OpenHantek6022 is the better front-end.
5. FNIRSI DSO-TC3 Pocket Oscilloscope / Component Tester
Pocket-sized 10 MHz scope, multimeter, and component tester in one. The "always in your bag" tool.
Best for: Best as a field scope for installs and a quick way to check whether a capacitor or transistor is dead.
Watch out for: Not a bench-replacement scope. Use it for triage and component IDs, not for waveform-perfect analysis.
6. Owon HDS200 Series Handheld Oscilloscope
Handheld two-channel scope with 70 MHz bandwidth, isolated channels, and battery operation.
Best for: Best for field service — anywhere a benchtop scope is not practical. Isolated channels mean you can probe across grounds without a smoke event.
Watch out for: Single-handed handling is awkward. Plan a wrist strap or a clip mount if you use it on a ladder.
What we would actually buy
Hobby budget under fifty dollars total: HiLetgo USB logic analyzer plus the free PulseView. Bench budget under three hundred: FNIRSI 1014D plus a real x10 probe set. Field/work budget: Owon HDS200 series for isolated-channel probing on installations.
FAQ
Can the HiLetgo clone really decode I²C and SPI?
Yes, in PulseView. Sample rate caps the maximum bus speed you can decode reliably at around 400 kHz I²C and 10 MHz SPI.
Will a USB scope replace a benchtop scope?
For audio, Arduino-era digital, and most maker projects — yes. For sensitive analog work or high-bandwidth digital, a benchtop is still the right answer.
What is the difference between bandwidth and sample rate?
Bandwidth is the highest frequency the front-end can faithfully measure. Sample rate is how often the converter takes a reading. Both matter — match the scope to the signals you actually probe.
Do I need isolated channels?
For anything line-referenced, yes. Hobby benches with battery-powered circuits — no, and you save a lot of money.
Is PulseView free?
Yes, free and open source. It also works with the more expensive Saleae units.
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