I have an infrared thermometer. It doesn't register the same temp as one I suspend in the river. I think it is the diffrerence between surface temp and demp on the bottom of the stream.

I bought mine here:

http://www.thermoworks.com/products/ir/index.html

Harbor Freight also has them for $25.00 Looks like the same one that Theremoworks has:

http://search.harborfreight.com/cpis...ared&Submit=Go

Locate a store here:

http://www.harborfreight.com/cpi/ctaf/retail_stores.taf

This expensive Theremoworks Thermometer looks the same as this less expensive Harbor Freight Themometer.