Attachment kit connects to multimeter in frequency measurement mode. It measures rotational speed of kits #15-17 or many other similar designs where wire coil rotates in the static magnetic field.
Attachment could be assembled in minutes – no special tools required.
Please note than this attachment must be connected to multimeter capable of measuring the frequency in Hz; if you do not have one you should consider RPM Measurement Kit #2.
For all brushless motors on our site (kits #1-9, 11-14) you should choose RPM measurement tool #1 (either as a complete kit or an attachment).
Uses four standard AA batteries (not supplied).