Product review (5 stars): found out the windings were good so it was most likely the start capacitor and ...
An extremely reasonable cost alternative to factory replacement parts.  When my upright freezer conked out I did a crash course on refrigeration on YouTube.  I tested the compressor, found out the windings were good so it was most likely the start capacitor and relay.  The compressor fired up as soon as I hooked this gizmo up.  I saved about $400 in that I did not have to buy a new freezer.  Very simple to install with good instructions.