• Visually monitor signal calls from the furnace/air handler circuit boards
• Interrupt those signals and send the motor any signals you desire to observe motor operation
• Get a visual display of motor rev/min and the calculated CFM
• Get a visual readout of all 4-system "taps", these selections help set up a system correctly
• Get a direct readout of the control voltage in the motor (low voltage here causes erratic operation)
• And finally, if a problem is traced to the motor, one switch press starts an automatic analysis to clearly indicate if the problem is in the motor's electronics, or one of 7 possible winding problems
• Microprocessor controlled, but easy-to-use, only 4 switches
• Rugged case with carry handle and lead storage compartment
• Full-color sleeve with point-of-purchase information
• Quick-reference card bonded to inside lid of case

The Variable Speed Zebra (Part VZ-7) is a comprehensive tool for working with ECM Motors and the circuit boards on the furnace or air handler that they require to operate properly. A training and educational DVD is included with each VZ-7.The Variable Speed Zebra operates in-line with the system, in real time, testing both major sections (motor and control circuit boards) simultaneously.