I have never tested a good digital one that was reasonably priced. That does not look like a good analogue one either however. A good analogue one must have two features a metal face card (not paper) and a calibration screw. i don't know that brand at all but if it has a calibration screw in the back it is easy to correct http://cigars.about.com/od/humidors/qt/hygrometers.htm
Digitals are very fragile and if they get dust on the sensing part they should be checked and/or discarded and also most recommend new batteries every 6 months as ANY change in power will alter the readings or any change in resistance also (dirt dust ect.). the real killer is many brands list in the specs what is acceptable by the manufacturer up and down. many are 5%+/- but some are 10%+/- allowable and some worse than this. Accurite being on of the worst listed specs of any thermometer/ hygrometer I have seen (4ºF+/- and 15%RH +/-) I would not suggest buying a hygrometer that cannot be changes with an adjustment. most of the adjustable digital units are easily moved (by your snake) and costly the test kit (salt and electronics do not mix well) and batteries make it an unnecessary on going expense.
My fav
http://www.amazon.com/Brass-Hygromet...ass+hygrometer
Digital
http://www.amazon.com/Csonka-Digital...er+calibrating
kit for digital hygrometer
http://www.amazon.com/Quality-Import...alibration+kit
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