It is totally transparent, so the white wall shows through. It works with a bimetallic coil, is easy to read and does not require any maintenance.
RT400 comes with adhesive on the back so that it can be mounted anywhere inside the fridge.
Blue marking for temperatures below zero, and red for temperatures above zero. 5 °C (optimal refrigerator temperature) is at '12 o'clock' , which makes it even easier to check.
Temperature Technology | Temperature Measurement Instruments
Temperature Technology manufacture and import a selected range of instruments for measuring and monitoring of temperature and related physical quantities, pH, mA, RH.
These include thermometers, ...