4iiii
4iiii Precision 3+
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Best Cycling Power Meters · head-to-head
4iiii Precision 3+ vs Magene P505
A sourced, side-by-side comparison. Magene P505 is cheaper at $349. Every spec and price links to its source.
Magene
Magene P505
$349
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | 4iiii Precision 3+ | Magene P505 |
|---|---|---|
| US price | — | $349 |
| Brand | 4iiii | Magene |
| Released | — | — |
| Mount type | crank-arm | spider |
| Measurement sides | single-sided | — |
| Accuracy pct | 1 | 1 |
| Weight grams | 9 | — |
| Battery type | CR2032 | rechargeable-liion |
| Battery life hrs | 800 | 200 |
| Connectivity | ANT+/BLE | ANT+/BLE |
| Power balance measured | No | No |
| Cycling dynamics | Yes | No |
| Waterproof rating | IPX7 | IPX7 |
| Warranty years | 3 | 2 |
Sources — 4iiii Precision 3+: 4iiii.com (verified 2026-07-13). Magene P505: magene.com (verified 2026-07-13).
What's the difference between the 4iiii Precision 3+ and Magene P505?
Where the two actually differ on the specs we track (5 of 11). Matching specs are omitted.
- Mount type: 4iiii Precision 3+ crank-arm vs Magene P505 spider
- Battery type: 4iiii Precision 3+ CR2032 vs Magene P505 rechargeable-liion
- Battery life hrs: 4iiii Precision 3+ 800 vs Magene P505 200
- Cycling dynamics: 4iiii Precision 3+ true vs Magene P505 false
- Warranty years: 4iiii Precision 3+ 3 vs Magene P505 2