Dissolved Oxygen Meter FM-DOM-A100 - Dissolved Oxygen Sensor Fison Dissolved Oxygen Meter measures 0.00–20.00 mg/L with ±0.2 mg/L accuracy and minimal salinity or pressure error. Auto-Read locks stable readings and alerts indicate calibration is due in 1–31 days. It supports 1- or 2-point calibration with customizable setup options. https://www.fison.com/dissolved-oxygen-meter/fm-dom-a100