Item is brand new and comes with full detailed how to test instructions.

Features: 
Measures AC/DC voltage, DC current and resistance
Tests diodes and batteries
Tests fuses, switches, solenoids and relays
Backlit LCD is easy to read day or night
Hold button retains display data
Automatic polarity sensing to avoid reversed test lead hook-up
Automatic zero adjustment for volts, amps and battery tests for accurate measurements
Low battery indication for user convenience (9V battery not included)
Auto reverse polarity
Auto zero adjust
Overload protection
Low battery indicator
10M Input
9-Volt power
Includes diode check
Includes: 
Color-coded leads
detailed manual
alligator clips