I have laced and trued my first wheel (YAY!) at home, while in the fork. It is fairly true (to the point I used to pay money for), but I am not sure if the spokes are tensioned properly (I guess it is possible to have ill-tensioned wheel which is true). How to check that? Also, if the spokes are tensioned OK on the whole, how to check if individual ones are off? Squeezing by hand doesn't show any noticeably looser ones.
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On a standard front wheel all spokes (both left and right) should (in theory) make the same musical note when plucked. A rear wheel is 'dished' to make room for the cassette. The non-drive side spokes will be at a lower tension (and pitch) than the cassette side. If you can find a bike with the same spokes and lacing pattern use that as a guide. If not, any newish bike can be used. Too much tension will damage the rim at the eyelets, whereas broken spokes are a sign of under-tensioning.
One thing that might help is an internal spoke wrench (not sure the technical term), they are designed to work from the inside of the rim, so you need to have your tires off. They are like a screw driver but with a pin that you insert into the head of the nipple and as you twist it, the spoke will push it out and all your spokes will be at the same tension.
From there you can go through and tighten them a little more if you like, just make sure you give every spike the same twist, 1/4 turn for example. The picture here looks like it was home made, and you could do something similar on your own with a screwdriver and a file.
This might not get you the "proper" tension, but it will give you even tension. With out a torque wrench, you just have to learn the tension by hand. I listen for the "pop" and gauge off of that.