Throughout 24 in. range (extendable to 30 in.), digital Altissimo maintains ±0.0008 in. accuracy at 68°F with repeatability of 0.0002 in. Height gauge lasts 80 hr on single charge to NiMH batteries. It measures ID, OD, center, and TIR, and displays min, max, or continuous reading. Instrument retains last calibrated dia, even after shutdown.