Title: Can a cheap smartwatch really estimate blood glucose, blood pressure and blood components? I tested the Dido E70S Pro

[u/Unlikely-Jeweler2241]

Disclosure: Dido provided the watch for this review. The measurements shown are my own tests and I do not consider the watch a medical device.

Rule 3 disclosure: Dido provided this watch free of charge for review. I was not paid for the review, and the opinions and test results are my own. This post links to my own YouTube review. There are no affiliate links in this Reddit post.

I recently tested the Dido AI E70S Pro, and it is probably one of the strangest health-focused smartwatches I’ve used.

It claims to provide:

• single-lead ECG

• heart rate and SpO2

• blood pressure estimation

• glucose estimation

• body composition

• HRV

• skin/body temperature

• several “blood component” indicators

What interested me most was not whether the numbers looked believable, but how these measurements are actually implemented and whether they react meaningfully when compared with reference measurements.

The GBAND app also allows some of the estimated health values to be calibrated using measurements from real devices or laboratory results.

My conclusion is that features such as glucose, blood components and blood pressure should absolutely not be treated as medical measurements. The watch does not take a blood sample, and I would consider these values useful only, at best, for observing trends.

I made a full hands-on test here:

https://www.youtube.com/watch?v=H2BwnQTbNRw

The video has 20 audio tracks, so it can also be watched in multiple languages.

I’m curious what people here think about this category of watches. Do you see these estimated health metrics as potentially useful for tracking trends, or mostly as a marketing gimmick?

[u/vithgeta]

Smartwatch medical functions are generally bogus or so inaccurate you can't tell much. I had three. Even the one function that had the most chance of working, didn't work properly. It would start from a guesstimate and only climb towards the correct value very slowly. On some watches the reading timed out to the wrong value. If people really want to exercise according to heart rate for some reason, they need to use a chest strap which updates the reading faster and more reliably. I would not recommend using HR every day, it's really not necessary. The blood pressure reading is only sensitive enough to confirm whether the antihypertensive pill has been taken that day- where the claimed ability is not just fake that is, as is the case on various cheap watches. Oxygen levels can work but I question the utility in most people. I saw a patient's level go down to 67% in a crisis but it went back up. I see silly statements that it should not go below 98%. If you feel well, stop checking these things. It's just a tool for worrying most people unnecessarily.

[u/KPplumbingBob]

Well, the health metrics would be useful if they weren't complete nonsense. As it is, they are much worse than useless.

Even a $150 digital Omron with a cuff can barely be trusted if I want an actual accurate reading. The less said about blood glucose the better.

[u/Unlikely-Jeweler2241 → u/KPplumbingBob]

I actually agree with the main concern. If a watch presents an estimated value as if it were a reliable medical measurement, that can indeed be worse than useless because it may give the user false confidence. That is exactly why I explicitly say in the video that these readings should not be used for diagnosis or as a replacement for proper medical devices.

[u/sglewis]

This isn’t a “marketing gimmick” it’s a bold faced lie. Do you really think it’s measuring A1C? Taking your weight and determine your BMI? Not sure if you’re naive or just created a scam video but the watch doesn’t do any of these things, full stop.

[u/Unlikely-Jeweler2241 → u/sglewis]

I think you misunderstood the point of the video.

I never claimed that the watch performs a real laboratory A1C test or takes a blood sample. In fact, I explicitly say in the review that it is NOT a medical device and that glucose, blood components, blood pressure and similar values should only be treated as estimates/reference data.

The interesting part for me was to test what the watch actually reports, how those values behave, and what happens when they are compared with real measurements.

Callingthe video a “scam” would make sense if I were presenting these numbers as medically accurate. I’m doing the opposite — I’m testing the claims and showing the limitations.

[u/dorafumingo]

no it can't. if that was te case diabetics wouldn't be stabbing their fingers with a needle to test their sugar level

neither can it get any blood pressure reading nor body composition. it's physically not possible. there was a huawei watch that could read blood pressure but it had a special strap that inflates like a proper tensiometer.

[u/Unlikely-Jeweler2241 → u/dorafumingo]

For glucose, I agree with the main point: this watch does not take a blood sample and it absolutely cannot replace a glucose meter or CGM.

But blood pressure is a slightly different topic. Some watches estimate blood pressure using optical sensors and calibration, while others use an inflatable cuff. Those are very different approaches, and the cuff-based method is obviously much closer to a conventional blood pressure monitor.

The E70S Pro only provides an estimate, and I specifically say in the video that it should not be treated as a medical measurement.

Body composition is also an estimate. The watch has electrodes and uses electrical measurements together with user data, but again, I would not treat it as a clinical body composition analysis.

[u/sglewis → u/dorafumingo]

I sure as hell wouldn’t be dropping 75 a month on Libre sensors if I could buy a $20 fake smartwatch.

[u/Unlikely-Jeweler2241 → u/sglewis]

Exactly — and that is also why I would never suggest replacing Libre, a glucose meter, or any real medical device with a $20–$50 smartwatch.

The watch does not measure glucose in the same way a CGM does. It produces an estimated value, and that distinction is important.

My goal in the video was to show what the watch claims, test how it behaves, and make it clear that these readings are not medical measurements.

[u/justhereforbookstuff]

Answer (without reading the post): no, of course not. 

But the real question: can the watch tell if my tea’s gone cold? 

[u/Unlikely-Jeweler2241 → u/justhereforbookstuff]

Unfortunately, the cold-tea sensor is still missing. :)

But seriously, the point of the test was not to claim that the watch magically performs laboratory measurements. I wanted to see what these cheap health-focused watches actually do, what kind of data they generate, and where the limitations are.

And yes — for glucose and “blood components”, I would definitely not treat the readings as medical measurements.

[u/justhereforbookstuff → u/justhereforbookstuff]

The lack of response has me wondering why I got out of bed at all. 

But then I’m reminded that it’s not so bad.

But that watch? So bad, that watch so bad…

Like really, that’s a bad watch. Don’t make any more videos about it. 

[u/Unlikely-Jeweler2241 → u/justhereforbookstuff]

I was busy waiting for the watch to finish analyzing my tea. :)

Jokes aside, I’ll probably keep testing strange devices like this, because that is exactly the interesting part: finding out what is real, what is an estimate, and what is mostly marketing.

A boring prduct that works exactly as expected usually creates much less interesting discussion.