This unit, which is designed for testing narcotics and strong non-narcotic drugs, offers both Plantar (Hargreaves Method) and Tail Flick testing with a single unit. Either testing system is also available individually. In plantar mode, the visible light/heat source is directed at the paw or other desired body part, and in tail flick mode it is directed at the subjects’ tails. Test up to 12 mice or 6 rats simultaneously. If desired, other animals like cats and rabbits may also be used. Tests are simple to setup. The focused, radiant heat/light source creates a 4 x 6 mm intense spot. Because the light is visible, you know when the test starts and ends. The equipment is silent (no whining or clicking sounds) to avoid triggering an automatic response in conditioned animals. You can set a humane cutoff timer that automatically shuts off the heat if no response is observed during the designated time frame.