No.	PRODUCT	MANUFACTURER	PRICE	RATINGS	POPULARITY	LINK
1.	SST Sensing LLC210D3SH Single Point Optical Liquid Level Switch, M12x1, 4.5 to 15.4VDC, Wet,	SST Sensing Ltd	£24.95		5.1	VIEW PRODUCT
2.	AC 110-240V 15A Fluid Water Level Sencor Control Float Switch	Sourcingmap	£10.68		5	VIEW PRODUCT
3.	sourcing map Liquid Level Sensor DC100V Fish Tank Water Float Switch, PP Plastic, 75mm, M10x1.5mm	sourcing map	£3.00		4.7	VIEW PRODUCT
4.	Analog Photoelectric Water / Liquid Level Sensor For Arduino,For Water Level Control And Protection Of Electrical Products	ZIYUN	£20.01	(from 1 review)	4.6	VIEW PRODUCT
5.	Sourcingmap 100mm Mini Vertical Stainless Steel Twin Channel Tank Pool Liquid Water Level Sensor Float Switch -30C to 125C	Sourcingmap	£6.67		3.9	VIEW PRODUCT