Oakton (WD-35661-70) Deluxe TDS Calibration Kit W-O Meter 20 inch x 4.5 inch Big Blue Filters2057 5" Big Blue mixed bed

5" Big Blue mixed bed deionization cartridge engineered to strip total dissolved solids from water down to near-zero levels

When removal efficiency drops below acceptable levels

Dimensions 10" x 2

NSF Certified 9

Thin-Film Composite Barrier

Oakton (WD-35661-70) Deluxe TDS Calibration Kit W-O Meter 20 inch x 4.5 inch Big Blue Filters2057 5" Big Blue mixed bedOakton Water Quality Meters Oakton WD 35661 70 Deluxe TDS Calibration Kit W O Meter Field ready calibration kit with NIST traceable standards for accurate TDS testing in demanding environments NIST Traceable Standards 1% Accuracy at 25C Hard Shell Case Five Point Calibration The Oakton WD 35661 70 Deluxe TDS Calibration Kit provides everything you need to maintain measurement accuracy in the field or lab, organized in a protective foam lined case.