If you are looking for a top of the range pulse oximeter then you must have a meter from Nonin. Nonin oximeters are known and famous for their high quality. The possible deviation in accuracy is very limited.
Nonin pulse oximeters are available in different variants and colors. They are available with a finger placement. There are also models available that use a separate finger clip sensor.
The most commonly used Nonin meter is the Nonin Onyx Vantage 9590. It is also used in the US military.