Calibration frequency depends on the instrument type and its regulatory role. Analytical instruments used for compliance monitoring — turbidimeters, chlorine analyzers, and pH meters — are typically calibrated or verified daily, with full formal calibrations performed monthly or quarterly depending on provincial requirements and instrument drift characteristics. Flow meters used for regulatory reporting are typically calibrated annually. K&D Pratt provides calibration services for all water treatment instrument types and can establish a calibration schedule aligned with your regulatory obligations.