Choosing between two used data acquisition recorders at similar prices often comes down to what each one tells you before you buy. The IOtech Personal Daq/56 states its resolution right in the name, includes four removable screw-terminal blocks, and comes with a USB cable. The DATAQ Instruments DI-500-16, by contrast, presents itself as a used instrument made in the United States, with less detail called out in the title. Both are used, and their prices are close, so the decision really hinges on how you intend to use the recorder.
Quick Verdict
If you want a clearly defined 22-bit USB data acquisition recorder with the screw-terminal blocks and USB cable included, the IOtech Personal Daq/56 at $599.99 is the more complete package. If you value a U.S.-made instrument and are comfortable paying $635.00 for the DATAQ Instruments DI-500-16, that is the unit to pick. The difference in price is about 6 percent.
Comparison Table
| Product | Price | Price Position | Condition | What Stands Out |
|---|---|---|---|---|
| IOtech Personal Daq/56 USB Data Acquisition System | $599.99 | Used | 22-bit resolution plus four screw-terminal blocks and USB cable | |
| DATAQ INSTRUMENTS DATA ACQUISITION SYSTEM DI-500-16 | $635.00 | Used | Made in United States |
Where Each Product Wins
- The IOtech Personal Daq/56 wins on specification and hardware. The product title states 22-bit operation, and the description points to the four removable screw-terminal blocks and USB cable.
- The DATAQ Instruments DI-500-16 wins on origin. It's the only one of the two that identifies the United States as its country of origin.
Product Notes
IOtech Personal Daq/56 USB Data Acquisition System DAQ56 22-Bit w/ Terminal Bloc
This used IOtech unit comes from a known-working classroom test system and is described as showing minimal signs of previous use. The description specifically says it was not removed due to a failure or problem, which adds a little peace of mind. You get all four removable screw-terminal blocks and the USB cable, which makes for a nearly complete wiring package. The 22-bit resolution is a solid, concrete spec. Since it's a USB model, you'll need a computer to capture data, so it's not a standalone logger. Used condition is always a consideration, but the provided photos show the exact cosmetic state, so you can judge accordingly.
DATAQ INSTRUMENTS DATA ACQUISITION SYSTEM DI-500-16
The DI-500-16 is a used data acquisition recorder from DATAQ Instruments, and the U.S. origin is clearly stated. That's a useful point if you want a domestically made instrument. The product description focuses on the condition and sale terms rather than a long list of specifications, so it helps to already know what the DI-500-16 brings to your bench. The seller's terms say the unit is sold as is and without warranty, which is something to weigh when buying used. If you have your own cables and connection strategy, this unit may suit you well. It offers a straightforward path for someone who prefers to keep the accessory list minimal.
Final Choice by Use Case
Choose the IOtech Personal Daq/56 if you're building a benchtop data acquisition setup and want direct screw-terminal wiring with a clear resolution spec and the necessary USB cable in the box. Choose the DATAQ Instruments DI-500-16 if you're a buyer who prioritizes a U.S.-made instrument and already has your own cables or wiring plan worked out. The minimal accessory approach of the DATAQ will suit you if you prefer to supply your own connections.
