Exact Measurement & Control (PTY) Ltd Verification and Calibration of Flow Meters Exact Measurement and Control (Pty) Ltd calibrate or verify any type or make on our calibration rig at our Sasolburg facility. Any size from: 10mm to 250 mm Our calibration records contain: K-factor and linearity error at different flow rates At the time of calibration or verification, all instruments used during the performance are traceable to International Measuring Standards Our prices are highly competitive and turn around time within two days or the same day if arranged.