The Accu-Guard™ meter is Aquest Inc.’s latest performance indicator device for filter cartridge monitoring. The meter is made from Noryl®, equipped with John Guest inlet and outlet fittings for 1/4?? O.D. tubing and is accurate to +/- 3 percent. Powered by two AA batteries, the Accu-Guard™ provides visual display of cartridge status as water is being consumed. Indicator choices include panel-mount type, universal under-faucet LED Disc, or an indicator of your own design.