SP Tools Circuit Tester Long Probe Heavy Duty - 6 to 24 Volts SP61014Tests 6 24 Volt electric circuits Heavy duty design and construction Sharp, extra long, insulated probe for access to hard to reach circuits Handle lights up if the circuit is good New coil cord design for ease of use Spring relief cord stretches to 3. 6m Leads remain flexible in low temperatures Heavy duty insulated alligator clip