水草情迷

The meter on the right (2-4 bar) shows 0 reading while the one on the left (70 bar) still shows around 60 bars. Could you please tell me what is wrong with that?

When there is no CO2, both meter should show 0 readings. I actually do not have much CO2. But why it still have 60 bars on the left?

Thanks,

有冇氣出, 如果有氣出, 右邊果錶多數係壞左喇...

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姓草名民，尚草下民，號刁民，因體胖，又名大肥。

有氣出 ar. but it is more after a while after it is turned on, the reading goes to 5 before it is turned off, but when I turned it on, it goes to 0 again.

It is only used for a few months.