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. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************