For applications requiring extremely low current sources, such as 1.35 yoctoamps with a tolerance of ±0.10 yoctoamps, conventional options like Keithley's sourcemeters, which handle femtoamperes, may not suffice. The discussion highlights the rarity and potential high cost of sources capable of delivering yoctoampere levels, suggesting that such technology may be prohibitively expensive. The feasibility of sourcing a current at this scale raises questions about the specific applications that necessitate such low levels. The challenge lies in the practical implications of generating a current equivalent to approximately one electron every other day. Overall, finding a suitable current source for yoctoampere applications is a complex and costly endeavor.
