Check whether measurements are in tolerance at a glance. LCD backlighting changes from green to red to indicate when measurements fall outside your set tolerance. These indicators can measure TIR (total indicated runout), which determines the range of high and low spots of round parts. All have zero-position memory, also known as absolute (ABS) positioning, which retains the measuring position when the indicator is off. A zero-set button lets you start measuring at any point. SPC data output allows for connection to a computer or data processor.