Hanna 1413 uS-CM Calibration Solution -- 16 oz Perlite 75% runs far above that

75% runs far above that window

The 24-inch length of the Super Flex tubing ensures that water reaches a broad root zone

It's highly soluble

Passive-Cooled QB120 Board: No fan or moving parts

No Indicator Card: The trade that brings the per-packet cost down wherever nobody reads a card

Hanna 1413 uS-CM Calibration Solution -- 16 oz Perlite 75% runs far above thatTDS solution are produced with high quality potassium chloride in various concentrations. They are standardized using a conductivity meter calibrated with NIST potassium chloride. The 1413 ? S cm solution is the one best suited for general use. This solution is also available in combination kits with the pH 7 buffer for the easy calibration of multiparameter instruments.