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Quick review of the Sensor Watch Pro

July 08, 2025 — Nico Cartron

Context

I already own a Sensor Watch (see this article for more details), and while I absolutely love it, I barely wear it.

Why is that? Well, mostly because the buzzer it uses is the F-91W default's one, which means I can't hear it, which is super annoying when using it as an alarm.

So I stopped wearing it.

But as I mentioned almost a year ago, Joey has been working on a "Pro" version of the Sensor Watch, which (among other things), brings:

  • a much louder buzzer,
  • an infrared light sensor,
  • an accelerometer,
  • and finally the 9-pin connector is back!

Assembling it

Here's what I received - from left to right:

  • Sensor Watch Pro board,
  • New custom LCD,
  • Accelerometer

and the "donor" F-91W on the right:

The board comes with an instruction guide:

The result

It took me about 30 minutes to assemble it: I spent a lot of time on the custom LCD, as making it fit into the plastic body was really hard.

Once done, here is how it looks:


Original F-91W on the left, F-91W with Custom LCD on the right

Using it

I have been using it for a few days now, so this is early, but at the same time I can compare with the original Sensor Watch.

What I like

  • Custom LCD: it is way better than the original one: more characters, more pleasant, more space, it's a real joy to look at
  • Buzzer: promise fulfilled, it is a lot louder, to the point that there's a setting to configure its level (low/medium/high). It can now wake me up without any problem!
  • Temperature: it's now built-in, and while I don't know whether I'll use it a lot, it's nice to have it. Of course, because it's close to the skin, it reports a value a bit higher than the real temperature.
  • Accelerometer: I haven't used it, so can't comment - but I have compiled a firmware with the activity complication and will report once I have used it.

What I dislike

Well, at that stage I haven't found anything to complain about.

Wrap Up

Really happy with the Sensor Watch Pro: it delivers what it promised, so I highly recommend getting one if you're into such things!


Tags: Geek


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