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IMPORTANT WARNING
The VTUSD is designed as a fast and convenient distance-estimating tool. While it is accurate to high tolerances, it
should not be used when exact, absolute measurements are critical.
INSTRUCTIONS FOR USE :
1. Place in position for distance to be measured (fig. 1). Press and release the 'ON' button and the display will show
all digits on, then distance reading. Once estimator display settles, the final reading is shown and 4 beeps will
sound. This indicates that your VTUSD has 'locked' the reading into memory. If in doubt, simply repeat to confirm
your measurement. (The VTUSD measures from its base to the target).
2. Your display will go blank 10 seconds after the reading or within 10 seconds if no reading is achieved. It is then in
the 'OFF' mode.
3. Your VTUSD will give you readings in : metres and centimetres, feet and tenths of a foot, which enables you to
easily multiply for area and volume calculations.
4. Press the 'MODE' key momentarily to alternate between metres and centimetres, feet and tenths of a foot, or feet
and inches.
5. Press the 'RECALL' key to recall last reading from memory. This function is active also when display is blank.
TIPS
If you see 'ERROR' on the display, your VTUSD is not receiving a properly reflected sonic signal, or you are aiming
at a range beyond its capabilities i.e. over 14.5 metres (47.5ft.) Corrective action : move closer to your target, or
adjust the angle of your instrument.
Caution : Sonic signals may not be reflected by certain sound absorbing materials such as curtains, upholstery and
carpeting. Irregular surfaces may also give a variance in readings.
If you see 'LO BAT' on your display, this indicates the battery is low.
Should this occur, remove the batteries and replace with three 3V lithium batteries (CR2032).
Your VTUSD is designed to operate from a minimum distance of 60cm (2 feet). If you attempt to measure under this
distance you will receive a false reading.
An object in the path of the VTUSD beam can give a false reading. Simply move the VTUSD above or to the side of
the obstruction.
VTUSD
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VELLEMAN
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