High quality unit with 37 test ranges and 10 testing functions - high current capability, good for starting/charging diagnostics. Auto power-off, Auto-ranging, Data Hold - Built-in Temp readings. Temp probe and carrying case included - full function Digital Mutimeter built-in. Clamp opening 1.5 inches - good choice for heavy-duty troubleshooting. Backlit LCD display Great tool for all around electrical troubleshooting. The ESI655 is ideal for all high current applications, especially starting and charging diagnostics. The ESI655 can measure up to 1000 amps AC or DC. Unit features built-in degrees F or C temperature readings.