Just to clarify,
@lisamamot, the binding indicator does not actually measure the release value, like the indicator on a fire extinguisher or a speedometer. It just moves up and down as you turn the screw, so it only tells you how far the springs are compressed. When the bindings are new, the indicators are reasonably accurate, but as the springs wear down with use, they become less accurate. Rust is another huge factor in weakening the springs, theoretically to the point of breaking when too much pressure is applied. Rust also jams the release mechanism, as can the absence of lubricants. The hinges and the casing can become distorted or cracked, further shifting the value.
I think the binding torque test is one tuning expense that cannot be substituted with DIY. Binding torque tests are not that expensive, like US$25 per pair, once a season. Considering how much we spend on food on the mountain, that's nothing. I've easily spent more on french fries the children won't finish.
If you like to change your DIN settings depending on the terrain, you can have the shop test them at all the settings you like to use. I don't know what they would charge for that, but they can tell you, like, "if you want DIN=6, make sure the indicator is on 6.75, and for DIN=5, use 5.5," or something like that.[/