A team from of Thopur police post made the finding on May 29.
It is believed the equipment, capable of detecting mines buried up to three feet underground, had been stolen with the intention of using it to hunt for hidden treasure.
Police in Anuradhapura arrested two suspects in connection with the theft and produced them before Anuradhapura chief magistrate Ruwanthika Marapana.
The court ordered that the matter be handed over to the CID, which has now launched an investigation.
The two suspects were remanded until June 11.
According to preliminary investigations, the suspects had rented the equipment to treasure hunters at a charge of Rs. 75,000 a day.