if you get used to it, blood oxygen will increase by nearly 10%. thank you so much for the kind words dear! he is having more than 20 years of teaching experience he has published 3 papers in international journals and 10 national journals. he could have just been doing the ‘politician’ thing of making you think he recognizes you, but when when i told him where i was working he seemed to be genuinely happy that i had done good. the sb-58 can also be used to connect to small devices, meters or other items that require the swivel function. 