An ignition laser, includes a laser-active solid-state body, a housing and a combustion chamber window, the housing having an inner sleeve and an outer sleeve. The frame may have rear fins or other features for facilitating dissipation of heat generated by the LEDs. The granularity of the scale is also dynamically adjusted as the range changes, affecting the legend on the graph andor the reference lines drawn on the graph, however, the granularity changes only as needed, and so the legend and reference lines allow the viewer to understand the dynamic changes in the scale of the graph.