The NEW iP501-222 Universal Optical Probes are designed for reading and programming ANSI and IEC electrical power meters. NOW, THERE IS NO NEED TO CARRY 2 OPTICAL PROBES FOR READING OR PROGRAMMING METERS THAT EMPLOY EITHER TYPE OF OPTICAL PORTS. In addition, these new probes incorporate a smaller housing design that makes them even more light-weight but still rugged with their Polycarbonate Glass Fiber Reinforcement material.