upi-50 instrument Multi-channel, multi-tasking digital ultrasonic instruments with unsurpassed near-surface resolution. upi-50 Front End: RPP2 Programmable square wave pulser preamplifiers. upi-50 Front End: RPP4 Multi-channel programmable square wave pulser preamplifiers. upi-50 Front End: LAM4 LAM4 offers a wide signal bandwidth, increased dynamic range and high ultrasonic signal-to-noise ratio. upi-50/SW - Spot Weld upi-50/SW Series ultrasonic instrumentation for easy-to-use, reliable inspection and evaluating of spot welds during production. Clad 2000 - Cladding Gages for manual and machine-controlled measurement of the thickness and quality of clad material.