No batteries, - untested. Looks unused. The Micro-Tect III Halogen Leak Detector Model 209907 is a specialized tool designed for detecting leaks in HVAC and refrigeration systems. This particular model does not require batteries, making it convenient and cost-effective for professionals in the field. With its focus on halogen detection, it is a reliable choice for pinpointing leaks and ensuring the efficient operation of these systems. Ideal for use in commercial and industrial settings, the Micro-Tect III offers precision and accuracy in leak detection tasks.