"35 years of optical measurement expertise has allowed HF scientific to become the leader in regulatory reporting turbidimeters. The HF scientific MicroTOL Online Turbidimeter has been specifically designed to meet regulations of the EPA and ISO 7027. Features include fast and easy calibration, verification in seconds, low maintenance, fail safe design which ensures your instrument is always reading accurately, bubble rejection system, automatic continuous ultrasonic optical cleaning system (except MicroTOL 2 models), and a data acquisition software system that allows logging and data storage for multiple turbidimeters."