Review on HHIP 4401 0038 Electronic Finder Diameter by Runbi Alvarez

Not the size listed, they have a 20mm shank with a 10mm ball. Their shank is not three quarters of an inch, they will not fit in a 3/4 collet. The first one broke straight away, the replacement also broke straight away, both had burned out batteries and severe corrosion inside. My cheap $20 works fine, but these ones because I didn't want to swap out my 3/4" collet for another that also has a 20mm shank. Both five star reviews for this product are fake. .