The surveillance equipment is in use in around 85 primary and secondary schools and colleges across the country.
Classwatch, the company behind the system, says it is being used as a way to monitor children who are disrupting lessons.
The firm said the equipment, which is sold with evidence bags approved by the Crown Prosecution Service to store material for court cases, can be used to compile "proof" of wrongdoing.
The system includes ceiling-mounted microphones and cameras and a hard drive recorder housed in a secure cabinet.
They cost around