This polarity free item by Sealey is a superb item, the only gripe I have is the 'contact' wires could be just a bit longer to make it easier to use in the engine bay. But nonetheless an excellent product from Sealey
Perfect for testing batteries safely with no sparks and get accurate results.
The PF model also means you don't need to worry about polarity in the dark.
Great buy and great product.