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Double Bass Evaporative Room Humidifiers

My way (please be gentle) is to put a wet towel over the heating radiator, and open the windows once a day. But my bass is worth only 3.5k

I understand the towel but why do you open the windows? Doesn't that dry things out again? Hey, whatever works for you. If you have a hygrometer (reasonably accurate digital ones can be had for about $10), and you're able to keep the humidity where you want it, then it really doesn't matter too much how you get there.
 
(reasonably accurate digital ones can be had for about $10)

Just a side note on cheap hygrometers: I bought some really cheap mechanical hygrometers (garanteed max 7% difference!) thinking that if was buying 2 of them, I couldn't go wrong. After a couple of days I realized that both hygro were inconsistently showing a 15%-25% difference (between the 2). If you do the math, you'll realize that using just one of those could be greatly misleading. I ended up buying more expensive hygrometers as I felt I couldn't trust the cheap ones. So for those who are looking to buy an hygrometer, I'd suggest to invest in a nice digital device first (Mines were about 30$).
 
I've never been happy with the cheap mechanical ones. I've done quite well with the $10 digital ones. I've compared across and found them to be typically within 2-3% of each other.