Choosing a data acquisition recorder often comes down to a trade-off between price and peace of mind. On one side, the DATAQ DI-720-USB with DI-5B amplifiers and a MESA interface is offered at $349.99. On the other, the Axon Digidata 1550A Low-Noise Data Acquisition System with HumSilencer carries a $4,999.99 price. Both are used and made in the United States, but they are aimed at very different buyers.
Quick Verdict
If you are on a strict budget and can handle a unit that is sold as-is and may need some cleaning, the DATAQ system gives you a complete hardware bundle for a very low entry price. If you need a low-noise system that is described as mint and fully operational, the Axon is the safer investment despite its much higher cost.
Price and Condition at a Glance
| Product | Price | Condition | Best fit |
|---|---|---|---|
| DATAQ DI-720-USB w/ DI-5B Amplifiers & MESA Interface | $349.99 | Used, sold as-is | Budget labs that can do a little cleanup |
| Axon Digidata 1550A Low-Noise System plus HumSilencer | $4,999.99 | Used, mint, fully operational | Labs that need plug-and-play confidence |
Where the DATAQ Wins
The DATAQ's biggest advantage is its price. It costs a fraction of the Axon, making it an accessible starting point for projects that are not financially demanding. It also includes DI-5B amplifiers and a MESA interface, so the bundle covers signal conditioning and the interface hardware. That means you don't have to piece together a system from separate components. The trade-off is the condition: the DATAQ is sold as-is, and it was very dusty when found and may need further cleaning. For someone comfortable with a little elbow grease, this is a low-risk way to get into data acquisition.
Where the Axon Wins
The Axon's edge is in condition and noise performance. This unit is described as mint and fully operational, and it includes the HumSilencer, which is designed to reduce electrical noise. For laboratories working with sensitive measurements, the low-noise design and the assurance of a working, cleaned system can be well worth the price. The Axon is a serious investment, but for a lab that values uptime and data integrity, it represents a direct path to reliable recording.
DATAQ DI-720-USB with DI-5B Amplifiers & MESA Interface
Given its low price, the DATAQ is the entry point you need if your lab's data acquisition budget is thin. The included DI-5B amplifiers and MESA interface mean you're not starting from scratch; the signal conditioning and interface are already part of the bundle. That makes it a practical stepping stone for learning, prototyping, or lower-stakes logging. The limitation is the condition. The unit is sold as-is, came from a university surplus setting, and was described as very dusty. The seller couldn't test it, so you should expect to clean it and verify its function yourself. If you're comfortable with that, it's a very low-risk financial commitment.
Axon Digidata 1550A Low-Noise Data Acquisition System plus HumSilencer
The Axon Digidata 1550A is the choice when your recordings demand low noise and minimal post-collection cleanup. It's described as mint and fully operational, so you get a system that's ready to use out of the box. The included HumSilencer is a meaningful addition for work where mains hum can corrupt your data. The flip side is the cost: this is a significant capital outlay at its high price. That price buys confidence, but it's only justified if your lab regularly handles sensitive measurements where a failure would be costly. If your projects are sporadic or exploratory, the high price may be hard to swallow.
Final Choice by Use Case
If your priority is a low entry cost and you're willing to put in a little work to clean and verify a surplus unit, choose the DATAQ DI-720-USB. It's the sensible buy for a secondary lab bench, a teaching setup, or a project with limited funding.
If your priority is a fully operational, low-noise system that you can trust for sensitive recordings, choose the Axon Digidata 1550A. It's the better fit for core research facilities and any environment where data integrity and uptime are non-negotiable.
