Practical and reliable TEWL meter – TEWL, evaporation rate and permeability measurements

Transepidermal water loss (TEWL) is the amount of water that evaporates through the skin. It is one of the most important indicators of skin barrier function. High TEWL levels signal barrier damage, which is linked to conditions such as eczema, psoriasis, and irritant dermatitis. Measuring TEWL provides objective data for dermatology, cosmetics testing, and skin research.

VapoMeter measures TEWL with a closed-chamber method. The device captures water vapor inside a sealed chamber placed on the skin, and built-in sensors calculate the evaporation rate. This technique provides fast, reliable results in seconds and is unaffected by ambient airflows or the instrument’s orientation.

The closed-chamber method protects measurements from external factors such as airflow, temperature changes, and humidity variations. This ensures more consistent, repeatable results compared to open-chamber devices, where environmental conditions can distort readings. VapoMeter’s closed-chamber design makes it ideal for both clinical studies and field research.

Yes. The VapoMeter is often referred to as a vaporimeter or vapourimeter. All of these terms describe a device for measuring transepidermal water loss (TEWL) using the closed-chamber method. The VapoMeter is the first and only fully portable closed-chamber TEWL meter available.

In vivo refers to measurements performed directly on living skin, while in vitro refers to tests carried out in laboratory settings, often using skin samples or Franz cells. The VapoMeter is designed for both in vivo and in vitro use, providing accurate TEWL measurements across clinical studies, cosmetic testing, and skin physiology research.