Solenoid voltage tester tests polarity and 120/600V AC/DC. Easy-to-read voltages. Dual voltage indication: Solenoid vibration sensing and electronic neon visual indication. Positive or negative polarity of DC indicated by neon lamp. Retractable spring-loaded prod shrouds protect metal tips and lock back out of the way for easy use. Compact and easy to carry. Case serves as prod holder for 1-hand operation. UL listed. 1 year limited warranty. 1 per card.