Description: [Efficient Coil Testing]: This solenoid tool is designed for quick and efficient testing of AC coils, making it an essential accessory for HVAC professionals and enthusiasts [Compact Design]: With a compact size of 5cmx1.6cm, this coil tester is easy to carry and store, ensuring convenience during fieldwork or in your toolbox [Sturdy Material]: Made from PP, this testing tool offers durability and reliability for long term use in various environments [Versatile Application]: Ideal for checking refrigeration solenoid valves, this keychain style tester provides versatility across different coil types and applications [Easy to Use Tool]: Its simple design allows even beginners to quickly assess the functionality of electromagnetic valve coils without any hassle Size Chart: 5cmx1.6cm or 1.97inchx0.63inch Package Includes: 1x Rotation Tester and AC Detector Note: Please allow slightly errors 1-2cm or 0.39-0.79inch differences due to manual measurement.