Check the listing for details. GENERAL TOOLS COMBO MOISTURE METER MM9. Condition: New – Open box. Listed at 23.99 USD. Open box tested working. Requires 9V battery not included. Item still has plastic cover on screen. Turn on and shows meter working see pictures. Introducing the GENERAL TOOLS COMBO MOISTURE METER MM9, a top-of-the-line leak detector that is perfect for HVAC and refrigeration professionals. This digital moisture meter is designed to accurately detect leaks in your systems, ensuring that everything runs smoothly and efficiently. Featuring a sleek and innovative design, this leak detector is easy to use and provides accurate results every time. With its advanced technology and user-friendly interface, the GENERAL TOOLS COMBO MOISTURE METER MM9 is the perfect tool for any professional looking to optimize their HVAC and refrigeration systems.