So, just how do you check your cell voltage monitors, etc? I have some 8.5 digit HP3458A multimeters and precision meter calibrators accurate to sub-parts per million, so I'm covered. Most home multimeters are rather inaccurate... +/- 30 mV on a typical 3.5 digit meter is doing real good (I've checked dozens of them).
One thing that you might find handy to have is some nifty little devices made by http://www.voltagestandard.com/ They are inexpensive little precision voltage references (.01%) powered by a 9V battery. I have several and they work well. They are available in several voltages that are in the range of what somebody playing with cell monitors, etc might be interested in. He offers periodic re-calibration for dirt cheap.
One thing that you might find handy to have is some nifty little devices made by http://www.voltagestandard.com/ They are inexpensive little precision voltage references (.01%) powered by a 9V battery. I have several and they work well. They are available in several voltages that are in the range of what somebody playing with cell monitors, etc might be interested in. He offers periodic re-calibration for dirt cheap.
