Main Features 1. 5 inch LCD screen with wide 150° viewing angle, beautiful and compact design. 2. Compact bench cradle with rotary electrode holder to save space in laboratory. 3. Small size and portable make it easy to carry and remove in laboratory and outdoors. 4. Extendibility: different electrodes can be installed to test pH, conductivity and dissolved oxygen. 5. Auto recognition of different electrodes after electrode is connected. 6. 3.5 mm jack input for electrodes makes it very easy for electrode connection. 7. Two USB one SD card interfaces for power and data transfer. 8. Can store 300 pieces of data including readings, date and time. 9. Rechargeable and long lasting battery. Auto shut off if there is no operation in ten minutes.