Bosean Electronic Technology BH-90E - Function Menu Operations

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For personalized setting or alarm records review/deletion purpose,
press on detection interface, then it will enter the function menu
(see below).
4.4 Function menu
4.4.1 Overview
4.4.2 Press or to choose a specific function, then press to enter.
Attention!
 About Gas Calib: Gas calibration is already completed by the factory,