Testing an SPG

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Segal's law:
"A man with a watch knows what time it is. A man with two watches is never sure."

LOL!

We did the test using my XS-scuba SPG and my buddy's Highland Millworks. It turned out that his reads 200psi lower than mine. Is this normal?
 
LOL!

We did the test using my XS-scuba SPG and my buddy's Highland Millworks. It turned out that his reads 200psi lower than mine. Is this normal?

...or yours is reading 200psi higher than your buddy's

Going back to that Segal guy :D
 
...or yours is reading 200psi higher than your buddy's

Going back to that Segal guy :D

Well I guess there is no end to this 'vortex of SPG uncertainty'? My buddy is planning to dive without making any adjustments. I am wondering if 200psi is such a big difference in the larger scheme of things...
 
https://www.shearwater.com/products/swift/

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