The World of D-Gray Man is full of technological devices designed for many purposes. Most of them are the result of the Black Order's research , specifically the scientific section.
Robots are talking, often human-like artificial devices. They are charged with typical tasks by their masters and are able to function by themselves.
- Komlin : A series of robots created by Komui Lee
- 65: A ghost-like robot created by the scientific division
- The Gatekeepers : A series of robots designed to watch the entry of the European Branch of the Black Order.
- Dolls: The Town of Mateel used to create dolls who dance and sing. Lala was one of them.
Some liquids or gases may have particular, or even unexpected effects serving diverse uses.
- The Komuvitan D: A substance originally created by Komui in order to do without sleep and make people work more. High dose transforms the subject in an angry zombie eager to spread the Virus.
- Memory Eraser Medecine: A potion used by the Black order to erase all the memories of the Order of those who quit it.
- Knock-out Gaz: A potent gaz that makes you feel asleep within 3 second of inhalations.
- Truth Serum: A serum that can be mixed with the food. When ingested it forces to reveal informations. The exact efficiency is unknown.
- Komuvitamin DII: A new liquid that is suppose to perk someone. It is said to be very efficient but has yet to prove this statement...
- Hair Tonic: Originally created for the Birthday of Bak Chan, this tonic grows incredibly long hair immediately after application. The effect wears off after some time.
- Feline Potion: This potion when poured one someone causes the person to meow like a cat rendering them unable to talk normally. The effect wears off after a short time.
- Rejuvenating Potion: This potion causes someone to grow physically younger to his child years. The effect wears off after some time.
Prehensile, portable technologies which need to be effectively used by someone.
- Wireless Handcuffs: High-tech handcuffs that allow one prisonner close from another person of place. If one of the 2 handcuffs detects escape thought or if the 2 handcuffs get 20 meters far from each others it will send a high voltage shock to both handcuffed people/thing. A creation of the European Branch's science section.
- Talismans: alismans, seen in several forms (including but not limited to lamps, round shields and heavy duty ballistic shields), are devices that work using unknown mechanisms to form cubed barriers of light that block/contain Akuma. Use is not indefinite; talismans run on battery power that will run out after extended use. They are many used by Finders.
- Phones: Finders have been seen carrying ahead of their time corded telephones.
- Innocence fixing kit: Komui Lee has a lot of items whose prupose is to fix a damaged innocence. The process is painful though.
- Radio Earring: A portable radio in the form of earrings made by Bak Chang. It has a stronger signal than the classi radio and is able to communicate as far as in the Noah's ark.
- Even if happens in the late XIX Century, the world of D.Gray-man appears to have developped some technologies that are even more advanced than the ones in real life. Those technologies , developed by the order and the noah family seem to be hidden from the society which explains why the rest of the worlds is similar to real life society of the time.