The phrase "a device that tests" is correct and usable in written English.
It can be used when describing a tool or instrument designed to evaluate or measure something.
Example: "The engineer developed a device that tests the durability of materials under extreme conditions."
Alternatives: "an instrument that evaluates" or "a tool that measures".
There will be a fishing simulator at the show, a device that tests one's skill in fighting a big fish, and for hunters there will be the "Virtua-Hunt," a video range that projects live action wildlife footage on a screen.
The selected entrepreneurs include people like Myshkin Ingawale, 28, of Biosense Technologies, which makes a device that tests women and children for anemia; Luis Duarte, 30, who started YoReciclo (I Recycle) in Monterey, Mexico; and Jamie Yang, 31, founder of a EGG-energy, a company based in Tanzania that sells rechargeable batteries through a portable power grid.
Replacing the thermometer with a device that tests blood pressure, diastolic pressure, your ECG, heartrate, and records and analyzes that, that will certainly be the new play and the new tool for American households".
Dr. John J. Mekalanos, a microbiologist at Harvard University, said he had used the cholera genome to make a gene expression chip, a device that tests when any of the bacterium's genes are active.
One worker said he had watched a supervisor cover a device that tests for lead emissions in the air with his cap, then whisk the inspectors away for tea.
To test this, Popular Mechanics sent a box containing a device that tests for gravity and acceleration to multiple places in the US.
Fourteen years ago, a team at Los Alamos National Laboratory, in New Mexico, built a spoofer by modifying a G.P.S.-signal simulator (a legal device that tests receivers' accuracy) and aiming it at a stationary receiver more than a mile away.
"What we've invented in the States is a trans-dermal monitoring device that tests a person's perspiration [for alcohol] once every 30 minutes.
Another attendee, Myshkin Ingawale, 28, recently quit his job at McKinsey & Company in Mumbai to start Biosense Technologies, which makes the ToucHb, an iPad-size device that tests women and children for anemia.
It was Abhishek's unsettling experience that convinced the Biosense team to try and invent a device that could test for anaemia.
If you travel frequently and stay in a variety of hotels, you may want to get a device that will test the telephone line to make sure that it is safe to use with your laptop's modem.
