Test 'N Tube products provide safe, convenient testing Capped 16-mm vials provide a self-contained package for mixing and measurement. Easy ordering All necessary reagents and vials are contained in the package. Description: Nutrients Testing Basic Reagent Set, Test 'N Tube Instrument: All except DR 900, PC II Number of tests: test each: Nitrogen, Total, LR • Phosphorus, Total, LR Platform