The phrase "a device that checks" is correct and usable in written English.
You can use it when describing a tool or instrument that verifies or inspects something, such as functionality or accuracy.
Example: "The new model includes a device that checks the temperature and alerts the user if it exceeds safe levels."
Alternatives: "an instrument that verifies" or "a tool that monitors".
"How often do you check your tire pressure?" asked Phillip G. Zaroor, president and chief executive of Advantage Enterprises Inc. of Harrisonville, Mo., which makes a device that checks tires every four seconds.
From behind bulletproof glass, in a space about as wide as the aisles of an airplane's first-class cabin, he manipulates tools that are Swiss made and high end: one contraption that opens watch cases and another that closes them; a device that checks if a waterproof watch is still waterproof; a machine that checks if a watch is running too fast or too slow within a 24-hour period.
Rather than conduct visual searches, Boston police officers will swab a bag, its seams and its handles with an electronic device that checks for traces of explosives.
Passengers stand at an electronic device that checks their iris patterns against iris patterns previously registered on their passports.
With that lure, some 12,000 of the nation's physicians have purchased an automated device that checks patients for nerve disease.
And we wrote a while back about a device that can check pulse and temperature from a distance using lasers.
Caren owns a device that allows her to check light levels outside their home; in early September and late May, she reports, it sometimes gets too bright for Katie to attend school.
Shortly after starting L-3 Communications in 1997, he invested $15 million to explore the potential for making a device that would let airports scan checked baggage more efficiently for bombs.
"There still isn't a device that can give you a complete body check," he says.
In addition to these measures, RelayRides only accepts cars that have gone through a safety check and installs a device that allows them to be unlocked with a special card.
Workers continually check ground moisture with a device that resembles a giant barbecue fork.
