tester
test|er /t'estər/ (testers)
1 [N-COUNT]
A tester is a person who has been asked to test a particular thing.
2 [N-COUNT] usu n N
A tester is a machine or device that you use to test whether another machine or device is working properly.
I have a battery tester in my garage.
1 [N-COUNT]
A tester is a person who has been asked to test a particular thing.
2 [N-COUNT] usu n N
A tester is a machine or device that you use to test whether another machine or device is working properly.
I have a battery tester in my garage.