Water Hardness & TDS Digital Tester Pen

Quickly check the total dissolved solids in your water with the CARA Water Tester Pen Digital TDS Meter. Compact, lightweight and easy to use, it provides fast TDS readings from 0–9999 ppm to help you compare tap water, filtered water, reverse osmosis systems, aquariums and more. Simply switch it on, place the probe in the water and read the result on the clear digital display. Best for: Home water checks, comparing filter performance, travel, aquariums, RO/DI systems and general water-quality monitoring.