Hart Scientific 1620 the DewK Thermo-Hygrometer / Read

Description

I have a couple of this units and they all do that same thing when I power them up.  Unit will power on to the main screen then go to a command screen and it says Systems: OK (see pic) then says no sensor attached and the power down command runs and the unit powers down (see pics).  I have no idea if this is normal so I'm selling as is with no returns.  Unit is power with a 9v battery and does not come with a power cable.
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