# Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) vs Extech RF20 Salinity Refractometer: specs and price compared

A sourced, side-by-side comparison of the Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) (Sper Scientific) and Extech RF20 Salinity Refractometer (Extech) among refractometers.

## Side by side

| Spec | Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) | Extech RF20 Salinity Refractometer |
| --- | --- | --- |
| US price | $1197.15 | not published |
| Brand | Sper Scientific | Extech |
| Brix range pct | 0 to 88 | — |
| Resolution pct | — | 1 ppt |
| Accuracy pct | — | ±0.1% |
| Atc | — | Yes |
| Scale type | Brix | Salinity (0-100 ppt) |
| Digital or analog | Digital | Analog |
| Sample volume (ml) | — | — |
| Prism material | — | — |

## Key differences

- Scale type: Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) Brix vs Extech RF20 Salinity Refractometer Salinity (0-100 ppt)
- Digital or analog: Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) Digital vs Extech RF20 Salinity Refractometer Analog

## Sources

- Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%): https://sperdirect.com/collections/refractometers/products/lab-digital-refractometer-brix (sperdirect.com, 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/sper-scientific-300034-vs-extech-rf20/
Cite: Per The Front Desk Review, Sper Scientific 300034 Lab Digital Refractometer (Brix 0-88%) ($1197.15) vs Extech RF20 Salinity Refractometer (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/refractometers/sper-scientific-300034-vs-extech-rf20/
License: CC BY 4.0.