Digitest™ II Pulp Vitality Tester Designed for optimal ergonomics and easy handling. Automatic one-button operation. Three rates of stimulus increase – slow, medium and fast. Unit remembers the previous rate of speed programmed. Micro-processor performs a self-test assuring proper function of the unit every time. Unit comes with 4 autoclavable probe tips. Runs on easily replaceable 9-V alkaline battery.