The lens of the IRt/c sensor is an optical instrument. Like a camera or eye glasses, a dirty lens will distort the view. If the Micro IRt/c - IRt/c is unable to see the heat clearly, it will be unable to measure it accurately, resulting in low readings.
Step 1:
Take one cotton tip out of the package.
Step 2:
Put the with alcohol-soaked side softly into the sensor and softly clean the lens by rotating the cotton tip.
Step 3:
Take one optical lens wipe out of the package.
Step 4:
Softly clean the lens with the optical lens wipe.