Holland Green Science Hephaestus V900 User Manual page 16

7.2 Functions
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F1: first layer measurement temperature
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F2: second layer measurement temperature
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F3: third layer measurement temperature
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F4: fourth layer measurement temperature
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"RUN" display of running status.
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"XX: XX" display of controller system.
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"STOP" display of set value.
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User Manual
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