7 Harbor freight multimeters??!!! You really broke the bank! Did that come up to $14? They are awesome! But after a year or so, if you leave them on all night several times on accident, you will have to get a new 9v battery, or throw down another $1.99 for a new volt meter/9v battery combo.
I just had a thought!
Take out the 7 HF batteries from the multimeters, put them in series, and drive your car with them! it would be 63v!!! Slightly better than the 60v you had before.
