The open chamber design maintains the free natural evaporation from the surface without interfering with the environment over the measurement area, thus ensuring unbiased and accurate readings.

For many years this has been considered the “gold standard” in water loss measurement.
Inside the measurement head, the sensors are protected to eliminate variation caused by air currents and direct incident light, which are problems usually associated with the open chamber method.

Consequently, the DermaLab probes do not require a protected environment – measurements may be performed in normal laboratory environments.​