In-Situ smarTROLL Multiparameter Handheld Operators Manual - Manual (Page 40)

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4. Place a water-saturated sponge in the bottom of the calibration cup. Place the
instrument into the calibration cup, and tap Start.
The calibration cup must be vented to barometric pressure. If you
are using the calibration cup pictured below, make sure the
vented cap is installed. If you are using the twist-on storage cup,
set the instrument in the cup, but do not twist it into place.
5. When the calibration is stable, tap the Accept button.