- The PROMOLAB® scale is printed and fused in the glass with a special process,
the graduation resists to all chemical products except fluoridric acid and hot soda. - The numbers are printed every 10 °C and the graduation is much larger than usual
enabling an easier reading for the user.
![Mercury Filled Thermometer, General Purpose](https://phytobiosophy.com/wp-content/uploads/2021/02/Glass-Thermometers1.png)