ChrisNik Pipe-Mic II 3′ Extension Arm The ChrisNik Pipe-Mic II 3′ Arm is an optional extension accessory designed to expand the reach of the Pipe-Mic II when measuring pipe inverts in deeper or difficult-to-reach locations. The extended measuring arm provides additional clearance and allows surveyors to accurately measure pipe sizes and invert elevations in large manholes or structures where the standard arm cannot reach. Key Features • 3 ft extension arm for the Pipe-Mic II measurement system • Provides additional reach for deep manholes and large structures • Maintains accurate pipe invert and diameter measurements • Durable construction designed for field use • Quick installation with the Pipe-Mic II system