The best used refurbished toughbooks are those that have batteries that will last 4+ hours.
They should have a functioning TouchScreen, The need a DVD, and that's how you restore your machine, They should come with System Restore DVD. Most important they should have GPS units. The Internal GPS Unit of the OEM Toughbook is old technology, and uses unnecessary power. GPS units that can be quickly added then removed are ideal. The CF-30 will out live the GPS technology. It's important to adopt to that technology. There are 3 USB ports. The Original Black Hawk SPEC-OPS Built in the USA, take advantage of the USB port with a mini, GPS attachment that plugs in. Calibrating the GPS is much easier than the built in GPS units, but perhaps the worst is the GPS unit that is made from CHINA components then hacked into the machine. What this means is you now have an inferior piece of hardware inside the machine, so when it goes out, your stuck. The BLACK HAWK Mini GPS unit can be replaced in less than 1 min. The other Black Toughbook GPS, requires either sending your machine back if there's a warranty or your stuck. Never put CHINA parts attached to the OEM Japan Manufactured Toughbooks.
You should support 100% original, because that's how a Toughbook stands out, all laptops made today are made in China except Panasonic. Go Original Go Black Hawk USA.