Amazfit
Device summary
Polar
Grit X2
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2025 |
| Starting price | — | $520 |
| Display size | 1.3-inch | 1.3-inch |
| Dimensions | 44.8 mm × 44.8 mm × 13.2 mm | 44.7 mm × 44.7 mm × 12.5 mm |
| Weight | 47 g | 39 g |
| Front material | — | Sapphire Glass |
| Back material | — | Plastic |
| Display | ||
| Display technology | AMOLED | AMOLED |
| Resolution | 466 × 466 | 416 × 416 |
| Peak brightness | 3000 nits | — |
| Protection | Sapphire | Sapphire Glass |
| Performance | ||
| Expandable storage | No | No |
| Storage | — | 32 GB |
| Battery & charging | ||
| Charging standard | Magnetic charging | Proprietary / USB-C. Smartwatch mode up to 7 days; performance training (GPS + HR) up to 30 h; eco training up to 90 h (power-save — not everyday life). Complete watch 62 g with wristband; body 39 g without |
| Battery type | Lithium-ion | Li-Pol (310 mAh) |
| Rated capacity | 500 mAh | — |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Offline full-color maps and route guidance, Polar Elixir™ (ECG GEN 1, SpO2 GEN 1, skin temp GEN 1, OHR GEN 4), Barometer; magnetometer compass; ambient light sensor, Polar Flow |
| Wi‑Fi | Wi-Fi | — |
| Bluetooth | Bluetooth | Bluetooth® LE |
| Build & durability | ||
| Frame | Fiber-reinforced polymer / Grade 5 titanium bezel | Plastic case; stainless steel bezel |
| Ingress protection | 10 ATM | WR50 (50 m); MIL-STD-810H |
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2025 |
| Starting price | — | $520 |
| Display size | 1.3-inch | 1.3-inch |
| Dimensions | 44.8 mm × 44.8 mm × 13.2 mm | 44.7 mm × 44.7 mm × 12.5 mm |
| Weight | 47 g | 39 g |
| Front material | — | Sapphire Glass |
| Back material | — | Plastic |
| Display | ||
| Display technology | AMOLED | AMOLED |
| Resolution | 466 × 466 | 416 × 416 |
| Peak brightness | 3000 nits | — |
| Protection | Sapphire | Sapphire Glass |
| Performance | ||
| Expandable storage | No | No |
| Storage | — | 32 GB |
| Battery & charging | ||
| Charging standard | Magnetic charging | Proprietary / USB-C. Smartwatch mode up to 7 days; performance training (GPS + HR) up to 30 h; eco training up to 90 h (power-save — not everyday life). Complete watch 62 g with wristband; body 39 g without |
| Battery type | Lithium-ion | Li-Pol (310 mAh) |
| Rated capacity | 500 mAh | — |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Offline full-color maps and route guidance, Polar Elixir™ (ECG GEN 1, SpO2 GEN 1, skin temp GEN 1, OHR GEN 4), Barometer; magnetometer compass; ambient light sensor, Polar Flow |
| Wi‑Fi | Wi-Fi | — |
| Bluetooth | Bluetooth | Bluetooth® LE |
| Build & durability | ||
| Frame | Fiber-reinforced polymer / Grade 5 titanium bezel | Plastic case; stainless steel bezel |
| Ingress protection | 10 ATM | WR50 (50 m); MIL-STD-810H |
Key differences
The most meaningful measured gaps in size and weight — not an overall winner.
Weight
Grit X2
8 g lighter · minor difference
Thickness
Grit X2
0.7 mm thinner
Height
Very similar height
Width
Very similar width
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Amazfit T-Rex 3 Pro 44mm is 0.1 mm (0.2% relative to Grit X2) wider. Check this difference against the width of your current device and pocket opening.
- Amazfit T-Rex 3 Pro 44mm is 0.1 mm (0.2% relative to Grit X2) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
- Amazfit T-Rex 3 Pro 44mm is 0.7 mm (5.6% relative to Grit X2) thicker. Cases and camera protrusions can change the clearance you need.
- Grit X2 is 8 g lighter. This is the listed device-weight difference, not a measured comfort rating.
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Amazfit T-Rex 3 Pro 44mm
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.