Testboy TB 55 Operating Instructions Manual page 24

Operations
Self-test
Press the button briefly to be-
gin a self-test. All of the Test-
boy TB 55's LEDs will illumi-
nate and then go out. Only a
white and a green LED remain
on.
Automatic power-off
The Testboy TB 55 features an automatic shut-off which acti-
vates after approximately 1 minute.
LED fluid illumination
The Testboy TB 55 has a special LED that can be used for illu-
minating the test probe and also for illuminating the fluid so that
dirt particles are visible.
This high-power LED can stay illuminated for up to 80 hours!
The LED has a life expectancy of over 100,000 hours.
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Testboy
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TB 55