Peace, mercy, and blessings of God be upon you. I am offering you a quantity of sensors as shown in the pictures. The row on the right has months left until the factory expiration date, and the one on the left expired a few months ago. The device comes with an app, and you can take readings via your phone. The product price is 250 in pharmacies, I sell it for 200, and if you take more than three, I will sell them to you for 170 riyals.