Never over water again or worry about turn on watering or not.  Simply program the digital water meter: one for cycle time and one for water time.  For example, watering twice a day, one on 7:00am and one on 6:00pm, and water 30 min each time.  Just setup set the timer to 12 hours and water time to 30 min at 7 am or 6 pm at first time.  It will automatically water same way every day after.  It will work with any type water device.  Very easy to install, simply screw 3/4" female inlet end of a timer to your water faucet and quick plug or screw 3/4" male outlet end to your garden hose.