Lovibond SD 310 Oxi DO meter has measurement of oxygen partial pressure / oxygen concentration / oxygen saturation / temperature measurement, auto hold function, alarm function, data logger + software, easy calibration against oxygen in air, salinity correction, self-polarising galvanic oxygen probe, allows instant measurement after system is switched on, low battery and battery charge indicator, sensor evaluation, after calibration in the display, shock-absorbing rubber protective armouring, waterproof IP 65 and IP 67.