An insulation tester is a device used to measure the resistance of electrical insulation in cables, motors, and other equipment. It helps ensure that the insulation is intact and functioning properly, preventing electrical leaks that could lead to short circuits or equipment failure. Insulation testers typically apply a high voltage to the insulation and measure the resulting current flow, providing a resistance value that indicates the quality of the insulation. These testers are essential for maintaining safety in electrical systems and are commonly used by electricians and maintenance professionals. Regular testing can help identify potential issues before they become serious problems, ensuring the reliability of electrical installations and compliance with safety standards.