Discover the FKGZJF Ring Sizing Kit—your ultimate solution to finding the perfect ring size effortlessly. Unlike unreliable string or paper methods, this precisely designed kit ensures a flawless fit exclusively for FKGZJF smart rings. Crafted with skin-friendly, high-quality materials, it offers a comfortable 24-hour wear test to determine your ideal size without discomfort. Suitable for men and women of all ages, it's perfect for the whole family. Plus, the FKGZJF Smart Ring boasts a powerful 3-5 day battery life on just a 2-hour charge, complemented by a portable 400mAh charging case that delivers up to 15 full charges—extending usage to 60 days. Easily charge your ring via magnetic USB or the case, compatible with Android 4.4+ and iOS 8.4+ devices. Your purchase includes the smart ring, charging case, dual charging cables, and instructions—a perfect gift for health-conscious men and women who value style and convenience.
✨Free delivery✨
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Smart Health Rings for Women Men, Fitness Tracker with Heart Rate, Blood Oxygen, HRV, Sleep Tracker, Step Tracker, No Subscription Fee, IP68 Waterproof Smart Ring (Only Ring Sizing Kit)
Experience the perfect blend of style and cutting-edge technology with our Smart Health Rings designed for both women and men. This fitness tracker monitors your heart rate, blood oxygen levels, HRV, sleep quality, and step count—all without any subscription fees. Crafted with IP68 waterproof rating, it’s durable for everyday life and rigorous workouts. The package includes only the ring sizing kit to ensure your smart ring fits perfectly for all-day comfort.
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Paste the label on a flat surface on the package
Make sure that both 1D and 2D barcodes are clearly visible
Ensure that the label is smooth and isn’t creased or wrinkled
Check for any tears, dents, holes or scratches
Pack your product tightly, with the right size packaging
Ensure both barcodes are on a flat surface of the package
Size
S
M
L
XL
Men
7-10
10-13
13-15
15-17
Women
7-9
10-12
13-14
15-16
Example Shown : SIZE XL, Hem to Hem 84cm OR 33 ,SIZE L, Hem to Hem 84cm OR 33 ,SIZE M, Hem to Hem 84cm OR 33 ,SIZE S, Hem to Hem 84cm OR 33
Rated 5.00 on the scale 1 - 5 based on 3 customer reviews
Maxwell T.
11/06/2025
Revolutionary Ring Sizing and Charging Experience!
Wow, this FKGZJF Ring Sizing Kit totally blew me away! No more guesswork or unreliable sizing tricks—the kit is spot-on accurate and super comfortable for all-day wear. Plus, the smart ring’s stunning 3-5 day battery life and ultra-portable charging case mean I can stay powered up anywhere, anytime. Perfect for anyone who values health, style, and seamless convenience!
Samantha R.
11/06/2025
Finally, Accurate Sizing and Long Battery!
I previously used generic ring sizers and another smart ring that often felt too tight or loose, but the FKGZJF Ring Sizing Kit made finding my perfect fit effortless and super comfortable. Compared to my last smart ring that needed daily charging, the FKGZJF’s 3-5 day battery and the handy charging case are a huge upgrade—much more convenient for everyday use.
Linda J.
11/06/2025
Finally—No More Guesswork With Ring Sizes!
I’ve always struggled to get my ring size right, and those flimsy strings just never worked for me. The FKGZJF Ring Sizing Kit made it so easy—I actually wore the sample around all day and barely noticed it! Now my smart ring fits perfectly, and the battery life is way better than I expected. Highly recommend, especially if you’re buying for the whole family!