Perfect for any layout or train set, the Bachmann Track Voltage Tester lets you check if and how much power your track has. Lights illuminate for 5-9V, 9-12V and 12V+. Works on all HO, N, and On30 track systems. Also shows polarity. The Track Voltage Tester is one of many handy Bachmann modeling tools.WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov