This is the Schwaben Digital Circuit Tester With Test Probes which works on 6-24 Volt systems.

Features:

• Check 6, 12 and 24V systems 
• With CE Approval 
• Coil cord stretches to 12-feet
• Digital display to read the accurate voltage value
• LCD indication for Power (Red) and Ground (Green)
• Probes utilize standard 4mm banana jacks to ensure compatibility with most circuit testing equipment and meters
• Comes with Piercing probe, Long Probe and small Probe

California Proposition 65 Warning

Warning: This product can expose you to chemicals including [DINP], which is [are] known to the State of California to cause cancer or birth defects or other reproductive harm.
For more information visit https://www.p65warnings.ca.gov/