SKC Product Code: 717-510L Bios Defender Model 510L (soapless) electronic Primary Standard Calibrator with lead-acid battery, 100-240V charger with multi-plug, Optimizer Collect Light Software, and 1-meter serial cable. Flow range: 5-500 ml/min. Software requires Windows XP (sp 2 or 3) or Windows Vista (32-bit version) and an RS-232 port or USB to RS-232 adapter. The Defender is built on next-generation DryCal technology. Volumetric accuracy is 1% of reading