Actron CP7677 Automotive TroubleShooter - Digital Multimeter and Engine Analyzer
This auto troubleshooter performs all standard electrical tests for on-car and bench troubleshooting, including tachometer, dwell, volts, ohms and diode. With an audible tone, it pinpoints problem areas and determines which components need repair or replacement and includes 24 ranges for more accurate measurements.  It is extra large, easy to read with digital LCD and the hold button retains display data. It includes a comprehensive user's manual and a 1-year warranty.