There are litmus paper pH testers out there but I don't know where you can buy them. If you know someone that works in any chemistry lab, they could probably get one for you. These papers can cover the whole pH range from 0 to 14 or you can get them to a more specific range of say 4 to 8.
I don't know how accurate it is but I believe all you need to do is take your soil sample and saturate it with water for a couple of hours to a day, stirring it occasionally. After it settles put the paper in the water and match it up with a pH. The problem is most of these litmus papers are good for readings like 6.0 or 6.5 or 7.0. They are not more specific than that, then you will want a true meter.