Product review (2 stars): Look elsewhere
If you can't install the software,,,,,.  Can't complete install because it can't find a file.

Included cardboard says User's Manual located between insert packaging.  It is not!  Then,when you find a manual on the internet, it includes no phone number to call for help.

My computer runs Win 7 64-bit.  included disk V 5.0 says XP, Vista, Win7 32/64-bit.

Update:  I emailed support@extech.com.  Steve replied quickly and had me download another (fixed) V5.0 from the Extech site.  That fixed the install problem.  If you need help you might try planetextech.com also.  Logger is working fine now,,,,but sure could have done without the earlier (yesterday) frustration.

Update: Used it about two days and realized I was looking at sticky bits (all data between 89.4 F and 97.5 F logged as 97.5 F,  all data between 80.4 F and 76.8 F logged as 76.8 F).  This condition makes the logger almost unusable.  Extech support said all returns within 30 days handled by the vendor (they didn't offer to send me a good logger).  So, Thanks Amazon!!!! you processed a return very quickly and simply.  No more Extech for me.  Oh yeah, soon as I processed the return, the green LED stopped working.