Woodpecker Ai-Pex Apex Locator With Built-in Pulp Tester FunctionKEY FEATURES: Large color screen: 3. 8" LCD Touch Screen across a 5" Display; Sound recognition: When the length indicator bar reaches a digital number below 1. 5, the machine intermittently emits low frequency beeps. The closer the tip is to the apical foramen the quicker the sound is. Sound level can be adjusted; Root canal length measurement: Auto calibration after startup; Enable working length control during preparation when connected to an Endo