OXYGEN METER Model : DO-5510 * -P circuit, LCD with display unit. * Dissolved oxygen range : 0 to 20 mg/L. * Max., Min., Memory recall button. * DO, Oxygen in air, Temp., ATC, Auto Cal., % salt. * Diaphragms & electrolyte included. * Probe head with diaphragm set and electrolyte are included. * Size : 180 x 72 x 32 mm. RS-232.