Fill one cuvette with blank solution (turbidity-free water) to the fill line

calibrate to 7

Approximately 50

Months 7-12: Replace with second 5-stage filter

Hanna Portable Low Range EC/TDS Meter - HI99300 RO system accessories Fill one cuvette with blankDesigned to bring simplicity to testing in manufacturing and environmental industries, the HI99300 Low Range EC TDS Meter is designed for measurements in pure and low ionic strength water applications. The specialized HI763063 probe features EC TDS and temperature in one convenient, rugged probe for low range EC measurements from 0 to 3999 S cm and TDS measurements from 0 to 2000 ppm. 2% EC TDS Accuracy Comes with all the necessary solutions and