"used singly" is correct and usable in written English.
You can use this phrase to refer to something that is being used alone, as opposed to being used in conjunction with other objects or ideas. For example, you could say: "These items are designed to be used singly, not as part of a larger system."
These organisms may be used singly or in combination to obtain the desired flavour.
Pulleys are used singly or in combination to transmit energy and motion.
In addition, he said, companies looking to back up trading or clearing operations in Manhattan have several choices that can be used singly or in some combination.
6. Antique Scroll Fencing is available in 60-inch wide units that can be used singly or attached for longer fences.
Chemotherapeutic drugs were used, singly and then in increasingly lethal combinations to try to destroy all abnormal cells.
"Yes, my friends, I believe that water will one day be employed as fuel, that hydrogen and oxygen which constitute it, used singly or together, will furnish an inexhaustible source of heat and light," he declares.
Skin craft range from inflated skins, used singly or joined together in a raft, to framed hulls of good form and construction.
Unani medicines are used singly or are compounded with other substances to achieve synergistic, antagonistic, or detoxifying effects or simply as bases for effective ingestion and assimilation.
Their resulting paper, Selection of Standards to Reference Terms in a Cheddar-Type Cheese Flavour Language, serves up a list of 21 terms to be used singly or in judicious combination: pungent, caramel, sweaty, creamy, fruity, buttery, rancid, cheddary, mushroom, mouldy, nutty, smokey, soapy, processed, sweet, salty, acidic, bitter, astringent and balanced.
The means that Brown used were natural: he employed neither carved stone nor architectural shapes but limited himself to turf; mirrors of still water; a few species of trees used singly, in clumps, or in loose belts; and the undulations of the ground.
Larger diameter rods can be used singly.
