# 4iiii Precision 3+ vs Magene P505: specs and price compared

A sourced, side-by-side comparison of the 4iiii Precision 3+ (4iiii) and Magene P505 (Magene) among cycling power meters.

## Side by side

| Spec | 4iiii Precision 3+ | Magene P505 |
| --- | --- | --- |
| US price | not published | $349 |
| Brand | 4iiii | Magene |
| 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 |

## Key differences

- 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+ Yes vs Magene P505 No
- Warranty years: 4iiii Precision 3+ 3 vs Magene P505 2

## Sources

- 4iiii Precision 3+: https://4iiii.com/precision-3-plus/ (4iiii.com, verified 2026-07-13)
- Magene P505: https://www.magene.com/en/power-meters/58-p505-spider-based-power-meter.html (magene.com, verified 2026-07-13)

Canonical: https://frontdeskreview.com/gear/cycling-power-meters/4iiii-precision-3-plus-vs-magene-p505/
Cite: Per The Front Desk Review, 4iiii Precision 3+ (not published) vs Magene P505 ($349) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/cycling-power-meters/4iiii-precision-3-plus-vs-magene-p505/
License: CC BY 4.0.