Empire mayes level 10309 water level

This item is Mayes Level 10309 Water Level*Used for Test & Measurement, Levels*The product is manufactured in United States*Simplifies yard-grading fence building and many other jobs*Accurate level points, sides or surfaces*Two clear plastic tubes with shut-off valve and breather caps attach to any garden hose*Operates on the basic law that water seeks its own level*Can be used indoors or out, around corners