he proven technology you have come to expect from Hach just got better. Built with the future of water analysis in mind, the DR 3900 Spectrophotometer will give consistently accurate results in a simpler testing format. If you need a portable solution, please call customer service at 1-800-227-4224 for the availability of DR1900. *RFID currently available only in US, Canada, Puerto Rico, Australia, New Zealand, and Colombia. Customers in other countries should order LPV440.99.00002.