The DigiFlow Digital Inline Water Flow Meter with Test Kit is a versatile water meter that gives you the ultimate peace of mind that your water filter is changed on time and is always operating optimally. Features: Capacity Mode: set a pre-determined capacity and the meter will count down to zero as water goes through the meter Countdown Mode: set a pre-determined interval in days (30 day increments) and the meter will count down once activated. Flow rate: in all modes the last flow rate recorded will be displayed in litre per minute Alarm function: in Capacity and Countdown mode the unit will alarm as the pre-determined limit is approached 3/8" Push Fit Connections The DigiFlow Inline Water Flow Meter sits either before or after your water filter system and provides an accurate reading of water use.