DeFelsko PosiTector UTG v.3.1 Full Manual - Manual (Page 9)

6
How to Measure How to Measure
1. Remove rubber cap from probe. Couplant
(glycol gel - included) must be applied to the
surface to be tested to eliminate air gaps
between the wear face and the surface. A
single drop of couplant is sufficient when
taking a spot measurement.
2. Place the probe flat on the surface. Use moderate pressure to
press against the top of the probe with the thumb or index finger.
When the probe senses echoed ultrasound, a coupled symbol
will appear on the display and thickness values will be
displayed. While the probe is coupled, the PosiTector UTG
continually updates the display.
3. When the probe is removed from the surface, the last
measurement will remain on the display.
Occasionally, excess couplant will remain on the probe when the
probe is lifted from the surface. This may cause the PosiTector
UTG to display a final measurement value different from those
observed when the probe was on the surface. Discard this value
and repeat the measurement.