The field-ready DR 900 handheld colorimeter allows quick and easy access to testing methods. It can test 90 of the most commonly tested water parameters. Ruggedly constructed, waterproof, dustproof, drop tested and shock resistant, it is reliable even in harsh and challenging field conditions. The instrument has a backlit display option for use in low-light areas with the push of a button. It can store data from up to 500 tests, and comes with a USB port for easy data transfer.