Tested & works.

Digital Thermometers: Includes one refrigerator thermometer and one freezer thermometer that transmit readings to the digital display

Easy-to-Read LCD Display: Comes with magnetic backing for fridge mounting and a keyhole for mounting on a wall

Customizable Temperature Alarms: Be alerted to temperature spikes caused by mistakenly leaving the fridge or freezer door open, or a failing appliance

Multipurpose Silicone Sensor Straps: Can be used with the included suction cups or wrapped around a wire shelf inside the fridge or freezer

Temperature Range: -40 °F to 100 °F (-40 °C to 37 °C)