Sigma
This little tool is a real time saver during physics labs. It calculates the uncertainty of meassured variables using the formula of propagation of error. Instead of typing every number in your calculator and then redoing it because you forgot something, you just do it once. Fast and easy. Additionally it also does the differentiation automatically using symbolic math.
Usage:
Here's a quick example. Say for example you want to calculate the time constant τ of an RC circuit: τ = R·C. The values you meassured are: R = (100 ± 10) Ω, C = (47 ± 4.7) nF . Just type everything in and press 'Calculate'.
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