Omron TH-839S Digital Ear Thermometer

Mouth and rectal temperature differs from Armpit and groin temperature. The range of temperature is 97 - 99 deg. Fahr. In my view you are suffering from fever.

Yes. Ask some Dr. to train you to measure sitting bp correctly. Or ask your wife to lie down and then record lying down bp.

This is very significant difference between two arms if bp was taken properly. You need to consult cardiologist immediately and may require physical examination and 2decho.

The accuracy of an infrared thermometer can be checked using a comparator at any stable temperature. However, to reduce the possibility of a difference in temperature between the inside surface and the base test hole, it is more accurate at 22°c, ambient room temperature. Let's connect over a call so that we can discuss your concern in details and make a suitable treatment plan for you.

No, different digital machines has their own different error value. Check on your machine?s box, it must be written over there. Usually it is around +~3 mmhg.