On Fri, 13 Oct 2017 01:09:24 -0700 (PDT), wrote:

Thank you for this thread!
It's been a maddening sleepless night due to a high pitched noise coming from the kitchen. Checked all the appliances. At 3am I started searching the internet.
After finding this thread I went straight for the drawer with my digital cooking thermometer. It was screaming! Pulled the battery. Finally, Silence!

Good for you. You make us proud. Now get some rest.