# Milwaukee Instruments MA871 Digital Brix Refractometer vs Extech RF20 Salinity Refractometer: specs and price compared

A sourced, side-by-side comparison of the Milwaukee Instruments MA871 Digital Brix Refractometer (Milwaukee Instruments) and Extech RF20 Salinity Refractometer (Extech) among refractometers.

## Side by side

| Spec | Milwaukee Instruments MA871 Digital Brix Refractometer | Extech RF20 Salinity Refractometer |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Milwaukee Instruments | Extech |
| Brix range pct | 0 to 85 | — |
| Resolution pct | 0.1 | 1 ppt |
| Accuracy pct | ±0.2 | ±0.1% |
| Atc | Yes | Yes |
| Scale type | Brix | Salinity (0-100 ppt) |
| Digital or analog | Digital | Analog |
| Sample volume (ml) | 0.1 | — |
| Prism material | Flint glass (with stainless steel sample-well ring) | — |

## Key differences

- Resolution pct: Milwaukee Instruments MA871 Digital Brix Refractometer 0.1 vs Extech RF20 Salinity Refractometer 1 ppt
- Accuracy pct: Milwaukee Instruments MA871 Digital Brix Refractometer ±0.2 vs Extech RF20 Salinity Refractometer ±0.1%
- Scale type: Milwaukee Instruments MA871 Digital Brix Refractometer Brix vs Extech RF20 Salinity Refractometer Salinity (0-100 ppt)
- Digital or analog: Milwaukee Instruments MA871 Digital Brix Refractometer Digital vs Extech RF20 Salinity Refractometer Analog

## Sources

- Milwaukee Instruments MA871 Digital Brix Refractometer: https://milwaukeeinstruments.eu/digital-brix-refractometer (milwaukeeinstruments.eu, verified 2026-08-12)
- Extech RF20 Salinity Refractometer: https://www.extech.com/products/RF20 (extech.com, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/refractometers/milwaukee-ma871-vs-extech-rf20/
Cite: Per The Front Desk Review, Milwaukee Instruments MA871 Digital Brix Refractometer (not published) vs Extech RF20 Salinity Refractometer (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/refractometers/milwaukee-ma871-vs-extech-rf20/
License: CC BY 4.0.