Review on 🎶 Hudson Hi-Fi Turntable Cartridge Stylus Alignment Protractor Kit - Enhanced Vinyl Player VTA Azimuth Ruler - Turntable Stylus VTF Force Gauge - Phono Cartridge Stylus Alignment Protractor for Optimum Performance by Jennifer Johnson

Not much to say about the clear plastic block with lines on it other than it looks pretty well made and it even comes in a nice storage case in its original shape. VTA tuning is best done by ear, but the Hudson alignment block allows you to quickly set the arm or carriage base parallel to the record as a starting point. I recently switched from a Rega P2 with no VTA adjustment to a Technics SL-1500c which has it. Being able to swap cartridges easily is great, but being able to quickly see and install a VTA as it's happening requires guesswork about some of the cartridge alignment.