The six rods are adjustable in either direction for calibration and wear compensation.Base length: 100mm.Rod: diameter 4mm.Measuring length per rod: 1"/25mm.Power supply: battery 1x SR44 Order Code PAN- 904-5020K supplied.Accuracy: Flatness of reference face (base): 2m.Flatness of measuring face of rod: 0.3m.Parallelism between reference face and measuring face: (4+L/50)m (fraction rounded up).Zero point error of rod: (2+L/75)m (fraction rounded up).Instrument error: 3m.Resolution: 0.001mm/0.00005"