18 Test Functions, 54 Test Ranges. Dual fuse overload protection. Milliseconds pulse width, measures fuel injector on-time. Measures Temp in both F and C, probe included. Carrying case, two sets of test leads, temp probe, RPM pick-up included Great DMM for the professional technician. The 590 can even test the pulse width of fuel injectors. Unit is completely auto-ranging and features a huge 2 inch high LCD display with backlighting. Modern design, the protective boot is built-in.   Auto Power-Off and Data Hold. RPM for both Conventional and DIS systems. Desirable 20 Amp test range