DeFelsko PosiTector 200 v.3.1 Full Manual - Manual (Page 5)

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Certification
All PosiTector 200 probes include a Certificate of Calibration. For
organizations with re-certification requirements, instruments may
be returned at regular intervals for calibration.
DeFelsko recommends that customers establish calibration
intervals based upon their own experience and work environment.
Based on our product knowledge, data and customer feedback, a
one year calibration interval from either the date of calibration, date
of purchase, or date of receipt is a typical starting point.
Wrist Strap
We recommend attaching and wearing the
supplied wrist strap.
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Protective Lens Shield
The LCD is covered with a thin plastic film for protection against
fingerprints and other marks during shipment. This film, while
usually removed before using the Gage, can be left in place to
protect against paint overspray or debris. Replacements can be
purchased.
Protective Cap
PosiTector 200 gages ship with a protective rubber cap over the
probe. Remove this cap prior to use. Replace it when the Gage is
not in use to protect the probe.
Couplant
Couplant is required to propagate ultrasound into the coating.
Water is a good couplant for smooth coatings. Use the supplied
glycol gel for rougher coatings. While it is unlikely that the
couplant will damage the finish or leave a stain on the surface, we
suggest testing the surface by using the couplant on a sample. If
testing indicates that staining has occurred, a small amount of
water can be used instead of couplant. Consult the Material Safety
Data Sheet available on our website and your coating supplier if
you suspect the couplant may damage the coating. Other liquids
such as liquid soap may also be used.