Red Lion Controls ASTC0000Product Attribute Attribute Value Primary Type Proximity Type Hall Effect Overview The ASTC boosts magnetic pickup signals by a factor of more than 100, and provides a NPN open collector pulse output which is compatible with practically all Red Lion Controls' Tachometers, Motion Monitors and Counters. Features: Ideal for Long Cable Runs Current Sinking Output Provides Ultra Low Threshold Speeds Allows Larger Air Gaps Provides High Noise Immunity