Starter 5000 Benchtop pH MeterST5000 B: ST5000 B meter, in use cover, stand alone electrode holder, 4GB flash drive, buffer powder set (4. 01,7. 01,10. 01), power adapter, manufacturer quality certificate and manual. ST5000 D: ST5000 B kit and ST350 electrode. High Performance Bench Meter for Universal pH Applications Starter 5000s performance is propelled by a 1000 item library, 10 sensors for calibration storage, 8 pre defined and 1 self defined buffer groups, 3 endpoint modes