#4Aperture Science Handheld Portal Device (Portal Gun)- Portal
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The Aperture Science Handheld Portal Device, originally marketed as Aperture Science Portable Quantum Tunneling Device and also known either as Portal Gun or by its acronym, "ASHPD", is an experimental tool used to create two portals through which objects can pass. It is used within the Enrichment Center's Test Chambers as the Test Subjects' primary tool to complete each chamber.
The ASHPD is hand-held device which has the ability to manufacture two linked portals. No matter the distance between them, any object which passes through one portal will emerge from the other and vice versa instantaneously. The portals can be placed on almost any surface which is flat, immobile, and large enough to accommodate them. Moving objects, or certain types of surfaces, will prevent the formation of a portal. Material Emancipation Grids will block any attempt to shoot portals through them, as well as reset any active portals should the ASHPD pass through it.
The ASHPD is held with a hand behind the weapon, holding the handle / trigger, while the other hand supports the barrel. A sprite in the small hole on the top of the ASHPD and a sprite in its glass tube have the color of the last shot portal. It has two triggers, one for each of its two portals.
When the ASHPD is fired, a burst of colored energy is emitted from the barrel, corresponding to the colored portal it is intended to create. Upon striking the targeted surface, a portal is formed, surrounded by a colored ring. If the surface cannot accommodate a portal for whatever reason, the shot will dissipate in a shower of colored particles. If one portal is shot into its opposite, the portal will be formed next to the first one, assuming the surface has enough room for it to form; otherwise, it will dissipate as normal. The device can only create two portals at a time. If a third is fired, the other of its type will be automatically closed and a new link will be formed.
The portals fired by the ASHPD each have a distinct color. Chell's ASHPD uses light blue and light orange portals. ATLAS and P-body each use a variant on those two colors; ATLAS uses light blue and purple portals, while P-body uses light orange and red portals.
The ASHPD also has a zero-point energy field manipulator, similar to the Gravity Gun but far weaker. It can pick up objects, but only those directly in front of it. It also cannot punt them as the Gravity Gun can, so the only way to throw the object is to physically swing the ASHPD itself, which can at best send the object a few meters away. It cannot catch Aperture Science High Energy Pellets, the equivalent of Combine Energy Balls, either due to the weaker manipulator or some difference in the composition of the two items. Items picked up with the ASHPD's manipulator can be carried though portals, which proves to be very useful in several test chambers.