Independent testing

How much independent testing exists for each angle grinder

Of the 9 angle grinders we track, 2 have been physically measured by at least one independent lab. Below is every one, ordered by how much independent hands-on evidence stands behind it — densest first.

A coverage record, not a ranking of which is best.

Product	Independent labs	Metrics measured	Outlets on record
Flex FX3171A-Z 24V 5 in. Variable Speed Brushless Angle Grinder with Paddle Switch (Tool Only)	1	2	1
Ridgid R86040B 18V X4 4-1/2 in. Cordless Angle Grinder (Tool Only)	1	2	1
Bosch GWS18V-45 18V 4-1/2 in. Cordless Angle Grinder (Bare Tool)	0	0	1
DeWalt DCG413B 20V MAX XR Brushless 4-1/2 in. Paddle Switch Angle Grinder (Tool Only)	0	0	1
DeWalt DCG415B 20V MAX XR Brushless 4-1/2 in./5 in. Small Angle Grinder with POWER DETECT (Tool Only)	0	0	1
Makita XAG04Z 18V LXT Brushless 4-1/2 in./5 in. Cut-Off/Angle Grinder (Tool Only)	0	0	1
Metabo HPT G12SR4 4-1/2 in. 6.2 A Slide Switch Corded Angle Grinder	0	0	1
Milwaukee M18 FUEL 2880-20 4-1/2 in./5 in. Grinder Paddle Switch No-Lock (Tool Only)	0	0	1
Milwaukee M18 FUEL 2980-20 4-1/2 in./6 in. Braking Grinder Paddle Switch No-Lock (Tool Only)	0	0	1

Each figure is a count of what independent testers actually did — how we count. A low count means little independent evidence has been gathered yet, never that a product is worse. See also the Angle Grinders buying guide and the reviewers we cite.