The phrase "a tiny device that" is correct and usable in written English.
You can use it when describing a small gadget or instrument that performs a specific function or has particular features.
Example: "The engineer developed a tiny device that can measure temperature with high precision."
Alternatives: "a small gadget that" or "a miniature instrument that".
The charity is testing the use of Square, a tiny device that when plugged into a smartphone allows anyone to accept credit card payments.
It's a tiny device that acts as a fast, portable data bucket for transferring files between computers (home and work, for example).
Timothy D. Cook, Apple's chief executive, recently said that each iPod model had a reason to exist, like the iPod Mini, a tiny device that did not have much storage.
Researchers copied that teeter-totter mechanism to create a tiny device that could be used in the next generation of hearing aids or to create adaptive microphones that focus on particular sounds or conversations.
By the following year more than 3,000 people were living with implanted pacemakers the size of a large wristwatch, and on Oct. 24, 1965, an article on the first page of the Sunday business section noted that more than 10,000 Americans "are probably alive today because of a tiny device that has been implanted in their bodies called the electronic pacemaker".
Now, researchers have demonstrated a tiny device that can emit single electrons through a conducting medium called a two-dimensional electron gas (2DEG), every nanosecond or so.
It's a little tiny device that we give away for free, and you just download some so wars from the app store and plug it in to your mobile phone or iPad and suddenly you can take credit cards.
The nanowires are arranged vertically like trees in a forest and a pair of tiny devices that read and write the data.
This time there is a picture of a pair of shorts containing tiny devices that measure what is going on in leg muscles when someone is cycling.
The entire industry has been hit by shortages of memory chips, displays, several types of processors and even humdrum components like capacitors -- tiny devices that cost a few cents but are crucial to managing power on chips.
Billions of people now carry around tiny devices that are more powerful than the desktop computers of a few years ago.
