... 5 points calibration (1 point per range):: Auto-ranging for conductivity:: Automatic temperature compensation:: Adjustable temperature coefficient (0 to 3.9 ... (K=10):: Temperature probe:: Power adapters:: Operation manual ModelLDR-950 Conductivity Range0~1.999, 19.99, 199.9, 1999uS/cm, 19 ... .99, 199.9mS/cm Conductivity Accuracy±0.5% F.S TDS Range0~Max.200ppt TDS ...