ZebraStat Tester Zebra Instruments # ZS-2 Troubleshoot Single and Multi-Stage, Residential and Commercial systems with ease using any or all of ZebraStat's 5 operating modes. Over/Under-voltage indicators quickly spot trouble areas. It's automatically-resetting circuit protection makes finding problems on modern ‘computer board' equipment less risky when shorts are present. Additionally, the entire ZebraStat is protected with the same auto-reset circuit protection. Features FREE SHIPPING! Multi-Mode Diagnostic Tool / Tester Remote Control Saving Steps and Time Reports Signal Levels on Control Lines with Visual Display Monitors Voltage Levels , Displaying as OK - Questionable - Low UPC # 768467300018 Easy to Use - The ZebraStat is a fully electronic, easy-to-use diagnostic tool for all HVAC and Refrigeration System Technicians. Inside its durable protective case you'll find a tool that quickly diagnoses low-voltage control problems in system wiring, control boards, thermostats, and associated components. Bright LEDs positively indicate OK/Not-OK status. A quick instruction card is printed on the inside cover; a full manual is included in English/Spanish. The ZebraStat has no batteries to replace. It has a heavy magnetic strip on the back and a slide-up hook for ease in use.