Knock grinders

Brew & Rate lists 3 Knock grinders.

All 3 use conical burrs.

All 3 are hand portable.

Median burr size is 38 mm, from 38 mm (Aergrind) to 47 mm (Feld47).

Median retention is 0.3 g, from 0.2 g (Feld47) to 0.3 g (Feldgrind 2).

The lowest retention here is 0.2 g, for the Feld47.

All 3 have single-dosing.

All 3 are stepless.

All 3 are built in United Kingdom.

Median release year is 2018, from 2017 (Aergrind) to 2022 (Feld47).

Prices run from €100 to €195, with a median of €120.

The Aergrind is the most affordable at €100; the Feld47 tops the range at €195.