App to monitor ext hdd temp

Hey everyone, I was wondering if there is a mac equivalent version of crystal disk info. If you don't know what it is here is a link: Crystal Dew World - Software - CrystalDiskInfo

I am running SL and have tried "drivesmart" but to no avail; it keeps crashing.

I also use istatpro but that does not provide me with any info about my ext hdds.

Thanks for the help.

atmonitor works with sl.