Are the sizes quoted the diameter of the main case bezel, or to the outer edge of the button? Trying to work out if the 38 is ok for wife’s wrists.

The sizes quoted are the diameter of the watch crystal. I have the larger 42mm size on my wrist. My wife has the 38mm and it fits her well. In my opinion, the 42 is too wide (big) for a slim wrist. I can't tell you which to choose, but I can say that the sizes are the diameter or the watch crystal. Good luck with your selection!

I have seen a video showing major discrepancies between the scanwatch and polar hr10 belt heart rate measurements, have those issues been resolved?

Yes. I compared a scanwatch with an Apple Watch on the same wrist at the same time and scanwatch was double (and ridiculously high). Withings said to return it and so I did.

Which size would you recommend for a man with an average to large wrist size?

Really just depends if you like a larger or smaller watch face. The band can be easily changed if too large or small. The watch helped confirm that I have AFib, and I'm having procedure to correct it next week. Priceless.

Should this watch breakdown/stop working, I have been told that these cannot be repaired even if sent to the factory! Is this correct?

I've sent two back ,one screen broken after a day the other casing cracked.Both refunded I think they are guaranteed for 3years . As for mechanical break down I don't know you would have to look on the withings site and ask .

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Withings ScanWatch – Hybrid Smart Watch with ECG, Heart Rate, Oximeter - 30 Day Battery Life - Smart Watches for Women, Smart Watch for Men, Fitness Tracker - Android & iOS,Black,42mm

Product ID: 225061309

Details

Battery capacity
140
Battery cell composition
Lithium
Connectivity technology
Bluetooth
GPS
GPS Via
Memory storage capacity
1 MB
Operating system
AsteroidOS

⚡30-day battery life

🩸Oximeter for blood oxygen levels

❤️ECG & heart rate monitoring

Description

⌚ Elevate your health game with timeless tech.

SEAMLESS SYNC - Effortlessly connects with Android, iOS, and Google Fit to centralize your health data.
HEALTH GUARDIAN - Advanced ECG and optical heart rate sensors deliver medical-grade insights on your wrist.
OXYGEN OPTIMIZER - Integrated oximeter tracks your blood oxygen levels for peak wellness awareness.
ENDURANCE CHAMPION - Unmatched 30-day battery keeps you powered through every meeting and workout.
SLEEK HYBRID DESIGN - Classic analog look with a crisp 42mm PMOLED display—style meets smart functionality.

The Withings ScanWatch is a sophisticated hybrid smartwatch combining medical-grade ECG, heart rate, and blood oxygen monitoring with a sleek 42mm analog design. Compatible with Android, iOS, and Google Fit, it offers a remarkable 30-day battery life, making it the ultimate fitness and health tracker for professionals who demand style and substance.

Specifications

ASIN	B08D6LZKV8
Age Range Description	Adult
Band Colour	Black
Band Material Type	Stainless Steel
Band Width	18 Millimetres
Battery Average Life	720 hours
Battery Capacity	140
Battery Cell Type	Lithium Polymer
Best Sellers Rank	111,845 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 4,454 in Smartwatches
Box Contents	Lithium battery
Brand Name	Withings
Case Material Type	Stainless Steel
Clasp Type	Tang Buckle
Closure Type	Buckle
Colour	Black
Communication Feature	GPS
Compatible Devices	google fit
Compatible Phone Models	Android, iOS
Connectivity Technology	Bluetooth
Controller Type	Physical buttons
Customer Reviews	4.2 4.2 out of 5 stars (4,442)
Display Type	PMOLED
GPS Geotagging Functionality	GPS Via Smartphone
Human Interface Input	Buttons
Item Dimensions	20 x 42 x 14 millimetres
Item Type Name	Hybrid Smart watch with ECG, Heart Rate Sensor and Oximeter, SpO2, sleep tracking
Item Weight	0.21 Kilograms
Language	Dutch, English, French, German, Spanish
Manufacturer	Withings
Memory Storage Capacity	1 MB
Metrics Measured	[ECG, oximeter, optical heart rate sensor, breathing disturbance sensor]
Model Name	Scanwatch 42mm Black
Model Number	HWA10
Operating System	AsteroidOS
Product Features	Activity Tracker
Product Warranty	2 year manufacturer
Resolution	240 x 240
Screen Size	0.63 Inches
Shape	Rectangular
Sim Card Size	eSIM
Sport Type	Multi-Sports
Style Name	42 mm
Supported Application	Fitness Tracker
Supported Satellite Navigation System	GPS
Target Audience	Men, Women
Warranty Type	Limited
Water Resistance Depth	50 Metres
Water Resistance Level	Waterproof
Waterproof Rating	IPX1
Wearable Computer Type	Smart Watch
Wireless Compability	Bluetooth
Wireless Provider	du

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Good experience, but the tracking updates could be better.

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