Four Element Measure A Single Aspiration Na & K As Standard, Li, Ca & Ba Optional At Extra Cost. Calibration Curve Fit Routine First Order & Second Order. Data Displayed In Concentration Units I.E. Ppm & Meq, Automatic Filter Selection, Auto Calibration Feature. Printer Attachment, PC Connecting Compatibility, Sample Data Storage More Than 500 Results. Password Detected Login Facility. Curve Calibration Up to 5 Standard. Multiple Calibration Curve Saving Facility, Stainless Steel Burner. Auto Gas Cut Off In Case Of Power Failure.