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Certainly looks like it. Since you're advised to calibrate your oscillators for the power-supply they're hooked to, an octave-tool like this one could work (in the slightest) different with differening surroundings. - If you plan on buying a multimeter, aside from the range, look for one to also include a frequency-counter to also use it later to check the pitch with an oscillators squarewave. Sadly, the reaaally precise Multimeters are quite the expensive ride. I got one for around 160 Euros and for the frequency-counter, it does not deliver more than a Data by Mordax.

In the end, I'm sure this module would come precision-calibrated as a prebuilt one. With a DIY-Kit, this will become much more important.