I use the old herpstat nd. reason you can adjust the temps by 1/10 of a degree, you can set high and low temp alarms, shows the power useage in % for the present time. has a resttable fuse. plus more.
I know spyder robotics just redesigned the herpstats recently. and they still have these features on some of the new ones. plus some added saftey features. I just recently purchase the herpstat 4. go on there website and do a little research. you won't be disappointed with the herpstat. good luck don