I have a Coherent LM200 OEM H20 detector for sale, it will work with any meter from coherent that uses the smart sensors with the 25 pin connector. The detector is calibrated to 0.40mV/W from 488-647nm but since it is a thermopile, it can do almost any wavelength. This would be great for high power YAG lasers. It can also do pulses up to 12J. This can measure in 1mW resolution and dows 2W easy without cooling. I just don't need it because I got a 10W detector for my Ultima.