Suunto Tandem User Manual download pdf (Page 10)

Because of an eye condition called heterophoria,

the reading accuracy of some users may be

impaired. Check for this as follows:

Take a reading with both eyes open and then close

the free eye. If the reading does not change

appreciably there is no disalignment of the eye

axes, and both eyes can be kept open. Should there

be a difference in the readings, keep the other eye

closed and sight halfway above the instrument

body. The hairline now rises above the instrument

body and is seen against the target (Fig. 5).

Code:

PM-5/360PC

TANDEM

350

190 180

180

View

Fig. 5. The hairline is seen against the target

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Suunto Tandem User Manual Page 10