A Tewl measurement device is used to measure the moisture (or water) content in a surface material.
What is a Tewl Measurement Device? - Gadzetdekho
A Tewl measurement device is used to measure the moisture (or water) content in a surface material. It is used to measure the physical properties of materials like leather, paper, plastic, paint and other materials that can be measured by this tool. The device is very handy as it uses a simple and inexpensive measurement method which helps in determining the physical properties of a material. This device can help you to determine if you need to apply more water or if the material is already wet enough.
