This is a great jumper. I neede to jump my diesel engine in my RTV and it started it right up. I use my RTV for everything and I was dead in the water when the battery died. I hooked the jumper up and it started the engine on the first try.
I have a tractor that's dead also and will use the jumper to get it going again.
This thing has saved me so much trouble that I would've had without it.
You'll be glad you got one.