APM stands for American Pacific Marketing.  I believe they were bought by
EIS.
International Light also makes radiometers, and they are quite good, for
about the same money as APM.

You can visit their web page at http://www.intl-light.com  or, here are some
numbers:

International Light
17 Graf Road
Newburyport, Mass
01950-4092

Phone: 508-465-5923
Fax:  508-462-0759

The web page is chock full of interesting and useful information on light and
light measurement.  I strongly recommend you check them out before buying a
radiometer.

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