Kestrel
®
4250 Racing Weather
®
Tracker
3
BACKLIGHT BUTTON
Press to activate
backlight for 1 minute.
MODE BUTTONS Press
to change mode of
measurements: Current,
Min/Max/Avg, Chart.
COMMAND BUTTON
In Chart Screens, press
to view data points. In
Setup Menus, press to
make selection.
MANUAL MEMORY
BUTTON Press to manually
store current conditions to
memory.
MEASUREMENT BUTTONS
Press to scroll between
screens: Date/Time,
Measurements, User
Defined Screens
POWER/SETUP BUTTON
Hold to turn power on or
off. Press to enter and exit
Main Setup Menu.
IMPELLER Zytec™
V-bearings on a user-
replaceable impeller.
IMPELLER COVER Swivel
cover protects impeller
when not in use.
DATA UPLOAD OPTICAL
COUPLER Software and
serial port interface sold
separately.
BATTERY DOOR Sealed
with o-ring to keep
product watertight.
TEMPERATURE SENSOR
Hermetically sealed precision
thermistor coiled to isolate
from case temperature.
HUMIDITY SENSOR Capacitive
sensor with secondary
thermistor to improve
accuracy and response.
SERIAL NUMBER
PRESSURE SENSOR Monolithic
silicon piezoresistive sensor.
Do NOT insert any objects
into this hole.
AAA BATTERIES
FRONT
BACK
