Dr Trust USA Non-contact Infrared Thermometer 603 

It means Low Temperature.

Hi.. Thank you for choosing Dr Trust. Are you facing any issues with the product? Please share your contact number. We will call you shortly to resolve the issue or contact us on Helpline no's: +919356658436,+917527013265 on Monday to Saturday at 10:00 am to 6:00 pm customercare@nureca.com

You can check user manual on our website drtrust.in/products/dr-trustusa-infrared-forehead-temporal-artery-thermometer-with-color-coded-fever-guidance

You just need to click the Blue Box on the page below text.