Water quality monitoring device and system thereof

A water quality monitoring device, comprising:

• an upper tube, having an opening at a lower end thereof;
• a middle tube, having an opening at each of upper and lower ends thereof;
• a first connecting member, having an upper end thereof connected to the opening at the lower end of the upper tube, and a lower end thereof connected to the opening at the upper end of the middle tube;
• a monitor, having a signal transmission wire sequentially passing an interior of the middle tube and the first connecting member, the monitor being in either one of two configurations of:
• configured at a lower end at the interior of the middle tube and protruding out of the opening at the lower end of the middle tube, or configured at an exterior of the middle tube and connected to one end of the signal transmission wire, the end of the signal transmission wire being fixed at the lower end of the interior of the middle tube;
• and
• a signal transceiving module, installed at an interior of the upper tube, coupled to the signal transmission wire.