BWT Aquameter HF3/8 Digital Water Flow Meter with LCD Display - Monitor Water Usage for Home, Garden, and Industrial Applications

BWT's Aquameter is an accessory that can be fitted to their filter head to monitor the flow of water in your filter cartridge. With just two buttons and an LCD screen, the Aquamater can easily be programmed with your water hardness and will track the total volume of water in gallons. Once it has been programmed, the meter will count down to 0 at which point it is recommended that your filter cartridge be replaced.