... slopeFive types of pH buffer solution can be chosen to conduct automatic calibration (one point or two points)Test ... and it can be connected to TP-16 printer. Also, the interface can be used to connect data collecting software and computer ... adjustment,Display,LCDCommunication interface,RS-232Software,1.1DCPower,Universal power adapter (9V DC,500mA,inside - positive, outside - negative) CE ...