Suunto Tandem manual Hairline is seen against the target

90	90
	Code:
	PM-5/360PC
	0

	N
W	E
	S

TANDEM

View	190	180	180
	10	0	350

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).

Fig. 5. The hairline is seen against the target

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