In various night version precise dot measuring work fields, not relying on any manual labor force input, it makes good job with a long wavelength made device, such as a Berlinlasers 980nm infrared laser diode module. The adoption of an import 980nm infrared laser diode and metal heat sink cooling system are configured with 16mm and 26mm diameter metal housing tube. It is working well with superior nice thermal emitting and highly stable infrared dot emission within long lasting time of 8 to 10 hours.
Available with an import IR laser diode within 100mW to 400mW, in order to assure easy and clear dot generation, this infrared laser diode module gets special use of a qualified glass coated lens and special use of a glass window. It is working well with no decay light and highly clear IR dot indication for laser experiment, infrared laser sight, military targeting, laser medical therapy and surveillance etc. 
https://www.berlinlasers.com/
https://www.berlinlasers.com/980nm-infrared-laser-diode-module
https://www.berlinlasers.com/high-power-980nm-600mw-1000mw-infrared-laser-diode-module