Storage Battery Systems Inc. developed the RT-100 micro-ohmeter for thos battery users that do not have the need to invest in a more expensive multi-function battery analyzer. The RT-100 measures cell or jar voltage in one step & displays internal cell resistance by depressing a key. Fixed resistance ranges are 40/400 milli-Ohms or 4/40 Ohms at .25% resolution. Maximum dc input voltage is 50vdc with preset ranges at 4v & 40v. Voltage FS accuracy is +/- 0.1% & resistance FS is +/- 1.0%. PC interface cable & adapters are included.