I have a Little Havana and it's worked fine. I think the first battery lasted about 3 years. Right now it's in a terrarium with a chameleon though; point being, I know enough about managing the humidity in the humi to not really need a hygrometer any longer.

Also using another cigar-shaped one in the coolidor that I thought came from Holt's but I'm not seeing it on that website. BestCigarPrices has one that has a remote sensor that looks pretty cool - the part that goes in the humi is also shaped like a cigar. $30 though. Both of mine were around $15.

The temp and rh accuracy ranges you post are not enough to sweat.