Hanna TDS Pens HI 98311 DiST5

Use Hanna Digital TDS Pens to help maintain consistent nutrient concentrations. The Waterproof model, DiST5, features a dual level LCD, temperature readings in both Celcius and Farenheit, automatic shut-off and calibration, and is 100% buoyant. This pen should be calibrated at least weekly to ensure accurate readings. It is critical to use Hanna calibration solution to avoid problems. This Model uses Hanna 1413µ. All units ship with a one time use packet of the proper solution.