I'm going to show you the procedure for calibrating your ISDT charger. I'm also going to show you my method for figuring out whether the charger is actually accurate, without using an expensive NIST-certified multimeter.
MANDATORY DISCLAIMER: I am a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for me to earn fees by linking to Amazon.com and affiliated sites.
Most or all links above are affiliate links, and I will receive compensation if you use them.