Bought a few of these humidifiers on Ebay. They are actually for guitar so they are a tad long for uke. Tested one over period of a week and it kept the humidity at 52% in my uke case when the mean humidity in my house is around 25%.
Inexpensive and effective.
http://www.ebay.co.uk/itm/271044973457?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Bill
Inexpensive and effective.
http://www.ebay.co.uk/itm/271044973457?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Bill