Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

This item isn't worth buying! It does not show the correct voltage! I have removed it and reinstalled it and each time the voltage is different. The range is 12.8 to 14.5 volts. I have check the battery voltage with my Greenlee volt meter and it consistently reads 13.8 - 13.9 volts.For some strange reason when I rated it with one star, it automatically jumped to four stars. Will try one star again.