WP
4
PotentiaMeter
Taking a Reading
37
light will flash once to indicate that the reading
cycle has started. In about 40 seconds, the first
measurement will be displayed.
How WP4 takes Readings
WP4’s cooled mirror crosses the dew threshold
numerous times to ensure the accuracy of readings.
When the instrument has finished its read cycle, the
water potential is displayed, accompanied by the
LED flash and beeper (if you have the beeper
enabled).
Cautions
• Never leave a sample in your WP4 after a read-
ing has been taken. The sample may spill and
contaminate the instrument’s chamber if the
instrument is accidentally moved or jolted.
• Never try to move your instrument after a sam-
ple has been loaded. Movement may cause the
sample material to spill and contaminate the
sample chamber.
• Take special care not to move the sample
drawer too quickly when loading or unloading
liquid samples, in order to avoid spilling.
• If a sample has a temperature that is much
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