The devices and associated materials were seized from a car stopped by police in Northampton yesterday.
Two men in their thirties are being questioned and the officer heading the investigation described the discovery as a "very significant find related to animal-rights activity".
A police spokeswoman said officers stopped and searched a red Vauxhall Cavalier following a police operation in Camp Hill, Northampton, shortly before 4pm on Saturday. "Two men ... one of them from London and the other from the Northampton area - were inside the car at the time. Both were arrested at the scene."Reuse content