Transdermal Moisture TesterReflecting the barrier function of the skin, it can be used for sensitive skin repair testing. Principle: The probe is pressed onto the skin to place it in a closed chamber state. The humidity inside the chamber increases as the moisture on the skin surface in contact with the probe evaporates, resulting in a corresponding increase in absolute humidity.
It can automatically determine the appropriate measurement time to ensure data accuracy.
By compensating for the forced stop time through response compensation and motion integration, the average absolute humidity transformation processing is greatly reduced, resulting in accurate measurement data.
The body is equipped with a high-performance CPU for real-time monitoring of humidity and temperature inside the chamber.
Detailed explanation of operation steps:
1. Power on and self-test: Connect the power and turn on the instrument switch. The instrument usually performs self inspection, with the weight display window showing "0" and the stability display window showing the initial value (usually room temperature). Some instruments require preheating for 20-30 minutes to ensure stable data.
2. Prepare test samples: For skin testing, select areas that are sweat free, hair free, and makeup free, and wait for 5-10 minutes after cleaning (until surface moisture disappears) for testing. For ex vivo skin (such as pig skin) experiments, the skin slices need to be fixed onto a diffusion pool, and PBS solution should be injected into the receptor pool and the bubbles should be vented.
3. Start measuring:
For direct skin measurement: Remove the probe head and press the power switch. After the monitor stabilizes, place the probe vertically and fully in contact with the testing area. Upon hearing the prompt sound, the data can be read.
For the diffusion pool experiment: Place the skin slices into the transdermal apparatus and control the skin surface temperature to balance at around 32 ℃ for about 30 minutes. Afterwards, insert the dedicated measuring probe of the instrument into the supply pool and briefly press the switch to start measuring.
4. Reading result: After the measurement is completed, the instrument will display the transcutaneous water diversion loss value (TEWL, usually in g/m ²/h). Comparing the test values with the critical values can determine the integrity of the skin barrier.
5. Conclusion and maintenance: After the test is completed, clean the probe with a soft cloth dipped in alcohol and cover the head cover. Turn off the power and fill in the usage record.