1. It is necessary to measure the liquid level in many occasions such as drinking fountains, water purifiers, humidifiers and other electrical equipment, agriculture, aquaculture and sub-control. 2. This contact photoelectric liquid level sensor is designed using the principle of optics 3. This sensor has the characteristics of simple structure and high bit accuracy. 4. The sensor has no mechanical parts, does not require additional debugging and has high sensitivity, low power consumption, corrosion resistance, high pressure resistance, high temperature resistance, and stability Module power supply: +5.00VDC Working current: Less than 12MA(Max) Working temperature: -25~105C Low level output: Less than 0.1V High level output: 4.6V Detection accuracy: 0.5mm Colour:blue Material:plastic Size:38.6 x 22.1mm Package Contents: 1 x sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.