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ALindemann Haha thats something normal, each time you do a compression and decompression cycle you are changing the work of the hearth to deliver blood, so you can't expect to do a test, repeat it and have the same results... Even if you do it in one hand and then the other, the more accurate thing you can do to compare is to do the test, keep the arm in the same position an level and 10 minutes after repeat the test and even here all you can expect are similar results