I purchased the 2100/120 but saw other versions (220/240, etc.) online.
Is the 2100 is just the base version and the voltage limits are upgradable?
The Keithley model 2100/120 6.5 digit DMM is not upgradeable to 220/240 power line voltages. This is because 220/240 is for Europe and other nations using that line voltage and there are no upgrade options. However, those other units can be purchased. Please refer to the link below to the data sheet for this family of product for more detailed information:
https://www.tek.com/en/manual/keithley-model-2100-6-1-2-digit-resolution-digital-multimeter-calibration-manual
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