How to check the speeds of internal fans

Hello. Concerning the defective logic board that causes fans to run fast, some people have implied that there are applications that allow you to check the RPMs of internal fans. I searched MacUpdate and VersionTracker with no vail. Does anyone know of any such application?
Thanks.

The mentioned aps are very good. But if you just want a quick check of the fan speeds, open a terminal window and type the following command:
ioreg -w 0 -n IOHWControl|grep "target-value\|location"
The output is the following:
| | | | "location" = "System Fan"
| | | | "target-value" = 1700
| | | | "location" = "CPU fan"
| | | | "target-value" = 1500
| | | "location" = "Hard Drive"
| | | "target-value" = 2300
| | | "location" = "sysclk slew"
| | | "target-value" = 0
Steve
PS - those are the normal fan speeds for my 20-inch ALS

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    Attachments:
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