Features Mechanical endurance:100,000times Electrical endurance:500,000times Environment: pool, oil, weak acid and weak base in water or oil tank,etc. Control level difference of less than 40cm not fit. Application The float switch is a switch which regulates fluid level in the tank or well etc.The float switch is resistant to water(sewaga water),it is relative capable of being used for oil,mostacids and alkalis.The float switch is not explosion proof. Note 1.Details page pictures is only for reference, part of a difference does not affect the user experience, please know it. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Please forgive it. If you use pump wattage over 500W, please use it with contactors! If you need contactors, you can click here or the following photo to buy !