Nobody uses them because the not accurate ! Look at hydro diaries !! Again nobody uses them because there not accurate .
If you have a pen but want back up I suggest u get another pen.
U say it's time consuming calibrating pens once a week for 20 seconds but you have to wait 5 mins everyday to get a inaccurate reading on a strip
Pens don't give a reading of 5.7219532 they just say 5.7
So I think you did get your question answered there . Don't use them as there not accurate 😁
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