Model 3440 1–3
displays an error message, or to signal the conclusion of a
measurement.
i A USB port that can be used to output data to a USB printer
or flash drive. A list of compatible USB devices is available
at: www.troxlerlabs.com/documents
i A serial port used to connect the gauge to a computer or
printer for data transfer and printing.
i An optional remote keypad, including a ¢START² and ¢ESC²
key, at the top of its source rod housing. See page 5–16 for
more information.
i In addition to the internal beeper, a louder external beeper
is available (see page 5–16). The external beeper performs
the same functions as the internal one, and can be enabled
or disabled as required.
The Model 3440 can also be equipped with an optional global
positioning system (GPS) receiver. The GPS receiver enables the
gauge to store precise GPS coordinates, along with the standard
date and time stamp, for each measurement. For more
information on the GPS option, refer to page 5–17.
ASTM Standards
The Model 3440 gauges meet or exceed all applicable American
Society of Testing and Materials (ASTM) standards (or
corresponding equivalent), including:
i ASTM D-2950: Standard Test Method for Density of
Bituminous Concrete in Place by Nuclear Method.
i ASTM D-6938: Standard Test Methods for In-Place Density
and Water Content of Soil and Soil-Aggregate by Nuclear
Methods (Shallow Depth)
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