A spirit level tells you when something is level. 
If you lay your iPhone on it's long edge with the screen facing you, you get a 
horizontal level.
If you hold the long edge of your iPhone against a wall, you're checking 
vertical level.
And, if you lay your iphone on a table with the screen facing up, you are using 
a plane level.
With any of these, your iPhone will tell you the amount of degrees that your 
phone is off of horizontal, vertical level, or plane level.
So, let's say I place it on a picture frame, on edge, with the screen facing 
me, and the level running. I can adust the frame until the iPhone level tells 
me that it's at zero degrees. This would tell me that the picture frame is 
level.
Do the same on shelving to check level from side to side, or from front to back.

I hope this helps,
Thom

Sent from my iPhone

> On Sep 19, 2013, at 9:17 AM, Wayne Merritt <[email protected]> wrote:
> 
> Pardon me for asking, but could you explain exactly what the spirit
> level refers to? How would you use that in putting up shelves?
> 
> Regards,
> Wayne
> 
>> On 9/19/13, Andy Lane <[email protected]> wrote:
>> Hi all, has anyone noticed the new spirit level feature in compass app???
>> Previously compass was just a compass but now if you 3 finger swipe to the
>> second page, you get a spirit level which is very accurate indeed.
>> Unfortunately it doesn't do less than 1 degree resolution which would be
>> even better but the accuracy is good enough for putting up shelves,
>> levelling pictures etc.  It also works on 2 axis simultaneously.  Very
>> impressive.  On a negative note though the compass app doesn't seem to read
>> out headings anymore so great we got spirit level but not so great they seem
>> to have broke the compass.  Hopefully I am wrong and doing something
>> incorrectly or they fix it very quickly.  Also very disappointed the Safari
>> bug where focus jumps around is still there.  I think that is the worst bug
>> iOS currently has for a VO user as some websites become completely
>> unusable.
>> 
>> Sent from my iPhone
>> 
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