The invention provides a temperature balancing device for a projection objective of a lithography machine. The lock mechanism may include a first contact point in which a pawl contacts a hook in the unlocked condition by an elastic force of a lock spring and a second contact point in which a cam contacts the hook in the unlocked condition by an elastic force of a push spring. The system and method are particularly suited for use in an online environment or may be utilized in conjunction with rough diamond analysis instruments in order to provide cutters with greater guidance as to the most appropriate dimensions to cut rough diamonds in order to maximize the yield of a rough diamond and to also produce a diamond of an acceptable grade. A heat sink, thermoelectric cooler and fan may be included to keep the forensic light cool. The specification further discloses the bridge, a forgeable one-piece lift arm assembly, a leveling pad for the forward ends of the lift arms, and a safety securing mechanism for securing the rearward ends of the lift arms independent of any force from the pushing means.