The Performance Tool W2987 Analog Battery Tester is a convenient tool for testing the charge level of various types of batteries. It is designed to provide accurate readings and help determine if a battery is still capable of holding a charge. The analog display of the battery tester allows for easy and quick interpretation of battery condition. It can be used to test the charge level of automotive batteries, marine batteries, and other types of rechargeable batteries. The W2987 battery tester is compact and portable, making it suitable for use in the garage, workshop, or on-the-go.