Dive computer battery and o-ring spec's

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-029 or -030 (my money is on the -029)
 
What is the best way to check the inside/outside diameter of an o-ring with calipers? I take it that I should avoid stretching the o-ring, but am not sure how to go about this.
 
Install it on a cylindrical object such as a drill bit-then measure the diameter of the cylinder. Drill bits are useful in that they are often marked in decimal. The outside diameter can be calculated by adding the i.d. + 2 X the cross section.
 
Install it on a cylindrical object such as a drill bit-then measure the diameter of the cylinder. Drill bits are useful in that they are often marked in decimal. The outside diameter can be calculated by adding the i.d. + 2 X the cross section.
Not sure that I can find a drill bit this big...
 

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Not sure that I can find a drill bit this big...

D'oh.....OK, I see what you mean. Measure the diameter of the cap that seals the battery case or the groove in the computer's housing. The cap should give you the i.d. & the housing groove the o.d.

By the way, unless you have a new o-ring, it's usually not a good idea to get the dimensions from the seal as they can stretch and distort. I do however, like Awap's dimensioning cone. Drop the seal over it and measure the diameter of the cone where the o-ring rest.
 
Any ideas for the Oceanic Pro Plus 2 O ring.

They use a CR-2 lithium battery

I have checked it with verniers and suspect its .070 x 1.364 which is an BS028 O ring???
 
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Any ideas for the Oceanic Pro Plus 2 O ring.

They use a CR-2 lithium battery

I have checked it with verniers and suspect its .070 x 1.364 which is an BS028 O ring???

British Standard and Aerospace Standard do not exchange directly. If your measurements are in inches. That would be an AS size -028

More important is the British pint vs the American pint. I look for pubs in the US that serve beer in British pints.
 
https://www.shearwater.com/products/swift/

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