Metric 203mm diameter collector with 0.2mm tipping bucket meets MET specifications for statistical accuracy. Every 0.2mm tip is transmitted to the indoor Dual Display and the gauge empties. You never have to empty the gauge. Each tip of the bucket shows 0.2mm on the indoor LCD Display. The RainWise wire rain gauge comes with a 18m cable to the LCD rain counter. Installation to the plug-in dual counter LCD display is easy. Mount the gauge out in your yard and records rainfall inside the house. The dual display allows you track both individual events and keep annual running total. The dual counter dislays requires 3 "AA" alkaline batteries and two button cell batteries. The button cell batteries are included and last several years.