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Truecal software to upgrade DR3900 or DR6000 spectrophotometers older than March 2018. Truecal from Hach reduces variations in results caused by variances in chemistry raw materials. A bar code contains the calibration curve data specific to each lot of chemistry, and automatically updates the calibration curve. With LCK products using the Truecal feature, you’ll have one less thing to worry about during crucial proficiency testing or permit-limit compliance testing.