The Modular Test Cages are designed for use in the most complex and demanding research applications. Both types feature 3 S-R module bays on each side of the cage for a total of 6. Each bay holds 8 module-height units. Modules for the mouse version are narrower than those used in the rat version. The test cages are taller than the hubs. The rat cage accommodates pigeons, larger rodents and squirrel monkeys.

Although originally designed for operant conditioning, these cages can also be used for feeding and drinking, lick suppression (Vogel Procedure), general activity monitoring, conditioned suppression (Fear conditioning and Freezing) and many other standard procedures.

Test cages may be connected to the hubs, running wheel, or other cages using runways. Runways may also be used to place reinforcement devices away from the rest of the S-R modules.

Both the rat and mouse test cages may be fitted with an optional non-shock, expanded metal floor or a grid shock floor. Cages accept the H20-95 photocell sensors to detect the animal's presence in the cage when runways are used to connect the cage to other arenas.

For convenience in cleaning, the cage floors and drop pan are easily removable. They simply snap off and slide out. A single connector disconnects the shock cable from the shockable floors so that the floor may be removed and replaced in seconds.

S-R module connections are made quickly with telephone type connectors to the Environment Connection Boards supplied with the HABITEST Linc interface modules.