I the last 50 years on working on car I have a extensive collection of tools but I do not have Spring Compressor nor a battery impact tool. Same goes for the Electrical as I have spent fortune on testing tools like spectrum Annaliser ($8000), Oscillator ($2000), The best flute Multi meters and other electronic stuff but on my Hi fi thing I have purchased color Meter for 4K calibration, A device than measure your 4K TV peak brightness in nits ( test that on the new 4K movie Aquaman ( This device is important as Tv Manufacturers fake the peak brightness). Trouble about me I have to many expensive hobbies and yet I have another stroke I forget how to use them so I have re -teach myself AGAIN!! LOL.