This compact tester allows testing of Total Chlorine, pH and ORP with interchangeable flat surface sensors (pH and ORP sensors sold separately). Read Total Chlorine from 0.00 ro 9.99 ppm with 0.01 ppm resolution and readings are not affected by sample color or turbidity. It has automatic self calibration, extra bold display includes an analog bar graph feature, 15 memory locations, automatic shut-off and low battery indicator. Meter includes 100 reagent tablets.