Connecting 3 phase motors to a power supply incorrectly can cause the motor to spin backwards, causing damage to the motor and the equipment attached to it. The Phase 3 from GTi Products can analyze motor and power line sequencing in one compact unit for surefire connections to 3 phase electric. The Phase intuitive readout gives the user easy-to-understand test results. A simple green light indicates the proper A-B-C sequence. It even detects whether it is connected to the motor or the power line!