Self-calibrating with an ion selective electrode (ISE) analysis method and parameters: K, Na, Cl, iCa, nCa, tCa, pH. Test speed is 45 seconds/sample. Ambient work temperature: 5-40 0C and relative humidity:?80% RH Sample: serum, plasma , cerebrospinal fluid and diluted urine Comes with built-in printer, Power: 220V±10V, 50Hz-60Hz,can transfer to 110V,50-60H. Interface:Serial port(RS232) Dimension:390mm×216mm×420mm