Economical Thermo Scientific® Orion AQUAfast™ II colorimeters are ideal for field or laboratory use. Battery powered, they weigh only 10 ounces, and are designed for simple, accurate, single parameter methods. Simple three-button interface for error-free readings. Chlorine Total tablets and powders are EPA approved. Eleven operational modes allow measurement of over 20 species based on methods accepted by national and international regulatory agencies. Reagents are provided in shelf-stable, rapid-dissolving tablets - eliminating loss of powdered reagent.