Pulsar PL76549 Thermion 2 XG50 Thermal Black 3-24x50mm Multi Reticle, 30mm Tube, 640x480, 12 Microns, 50 Hz ResolutionThe Thermion quality fast aperture germanium optics ensures optimal heat energy transmissivity minimizing noise and improving detail of observed scene. Use the brightness and contrast adjustments to maximise the detail and informative value of the image in specific observation conditions. The User Mode function saves selected brightness and contrast settings in the device's memory providing optimal image quality for the next use of the thermal imager