Question 1

How low will the oxygen level read?  I have one that won't read below 94%.

Accepted Answer

Who knows? The actual item for sale is not as described. It claims it is a Contec CMS50DL, but what the seller actually sends is a JZIKI JZK-302 (which sells elsewhere for 1/3 of the price or less). When Newegg directed the seller to answer my questions, the seller claimed the item sent "uses the same chip" as the advertised item.

Question 2

The device does not turn on even with new batteries.  What should I do do?

Accepted Answer

check battery polarity  hold button about 20 seconds and it might reset

Question 3

Is this FDA approved?  How accurate is it?

Accepted Answer

The NIH has tested it, and it met ISO criteria for accuracy (within 3%). But expect to wait a long time for it (at the time of this writing). Ordered almost three weeks ago and has yet to arrive in the U.S. from China. Product image saying "USA USPS 2 -- 5 days" is misleading. Maybe that is how long it takes once the USPS receives it, but not useful information for actual shipping time.

Questions & Answers