We put the multi-datastream graphing capabilities of the Topdon ONE series up against the Snap-on Verus Edge, using OBD graphing mode to ensure equivalent results across both tools. Here’s what the comparison revealed.

Setting Up the Test

The comparison used four data PIDs: commanded equivalence ratio, fuel rail pressure, calculated load, and engine speed. Notably, the Snap-on tool lacked coverage for the specific vehicle tested, so the comparison was conducted purely over generic OBD. The Snap-on unit used was a Verus Edge, fully updated—described in the video as not Snap-on’s flagship, but still one of their more expensive tools.

Snap-on Verus Edge: Sluggish Response and Limited Detail

With the four PIDs graphed on the Snap-on, the engine was revved a couple of times. The results were underwhelming: the graph response times were described as “pretty slow,” and the level of detail captured was “pretty lacking.” Zooming in did not improve matters much—the detail remained limited, and the response stayed slow.

Topdon ONE: Fast Response and High Resolution

Switching to the Topdon ONE, the same four OBD data PIDs were graphed: calculated load, fuel rail pressure, engine RPM, and commanded equivalence ratio. The difference was immediately apparent. Revving the engine showed the Topdon ONE to be extremely responsive and very quick, with really good resolution providing a lot of detail. As the accelerator was hit, the graphs moved right away.

Independent vs. Integrated Graphing Modes

Topdon ONE’s graphing modes:

Independent graph mode – each PID graphed separately.

Integrated graphing mode – all four data PIDs shown together on one graph. In this mode, users can change the colors of individual graphs by tapping on them, and zooming is supported (though the zooming was noted as needing “a little bit of refinement yet,” while still definitely working). The integrated mode was shown to be quite fast and responsive as well.

Additional Features

A particularly useful feature highlighted was the ability to tap anywhere on the screen to get the values for all four channels at that arbitrary point in the capture. Users can also scroll back and forth through the captured data.

Summary

The takeaway from the demonstration: even against a fully updated, more expensive Snap-on tool, the Topdon ONE delivered noticeably faster, more detailed multi-datastream graphing—with useful extras like integrated graphing, color customization, and point-tap value readouts.

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