The phrase "pair of scales" is correct and commonly used in written English.
It refers to a weighing instrument consisting of two pans or plates suspended from a horizontal beam, used for measuring weight or balancing weights. Example: When preparing for their chemistry exam, the students used a pair of scales to weigh out precise amounts of each chemical needed for their experiments.
The pair of scales represents a weighing of the evidence.
A courthouse judge, dangling on strings, his heart and lungs balanced on a pair of scales.
Before him, on a small table, is a pair of scales and by these a clutch of silver coins.
The balance between subterfuge and the public interest is like a finely-balanced pair of scales.
Where one gold-trader had his shop, only a gold-paint picture of a pair of scales remains.
Sideways Charles had some pretty unsubtle art on his walls – a picture of a pair of scales with a black and white stone.
The KOL/MAC LLC team's presentation is also particularly innovative because in addition to a pair of scale models, they have created a hologram of their proposed building.
The F-statistic is calculated for each country separately under the assumption that the difference of the fixed effects between each non-redundant pair of scaling models is zero, that is, (varvec{L}=varvec{I}) and (varvec{m}=varvec{0}).
Although nothing is known about the behaviour of deepwater scale eaters, such a relationship might also be found between the deepwater, syntopic pair of scale eaters, P. elaviae and P. eccentricus, which also differ in oral tooth shape.
To evaluate the seismic performance of the model structures following the FEMA P695 process, incremental dynamic analyses of the model structures are carried out using the 22 pairs of scaled far-field records provided by the PEER NGA Database (2006).
Duncan Weldon, Newsnight's own economics correspondent, who gets out a pair of toy scales and shows Evan how deficit reduction and tax giveaways have to balance.
