Hach Nitrate Ionic Strength Adjustor (ISA) Powder Pillows, pk/100, 4456369By Hach $85.89 | PK Quantity discounts available QuantityPrice Product #: 702088Mfr. Part #: 4456369 This item is in stock Quantity -+ Add to Cart Free Ground Shipping On All Orders Over $1500!*Conditions Apply* Details Description Ionic Strength Adjustor (ISA) for Nitrate determinations by Ion Selective Electrode (ISE) method. Powder form prevent from diluting sam... DetailsBackDescription Ionic Strength Adjustor (ISA) for Nitrate determinations by Ion Selective Electrode (ISE) method. Powder form prevent from diluting samples. Ideal for low Nitrate level readings. Eliminate most interferences. Pack of 100 powder pillows.