I have a low charge so I might pick up a can of 134a with dye. I already have a black light. Are the glasses necessary, or are they a gimmick? Thanks.
They help filter out the reflected uv light from other areas so the dye sticks out. If you can search in complete darkness (or close to it) it's bettertjkj2002 said:The yellow glasses make the smallest leak and all other leaks stand out much better then just using the UV light itself.