Mechanical crushing is also a technique capable of releasing argon from a single sample in multiple steps.Laser probes also allow multiple ages to be determined on a single sample aliquot, but do so using accurate and precise spatial control.
Likewise, because of heterogeneity problems with the MMhb-1 sample, the K/Ar ages are not always reproducible.
This imprecision (and inaccuracy) is transferred to the secondary minerals used daily by the Ar age equation will become continually more refined allowing much more accurate and precise ages to be determined.
Because the J value is extrapolated from a standard to an unknown, the accuracy and precision on that J value is critical.
Instead, the ratios of the different argon isotopes are measured, yielding more precise and accurate results.
Additional advantages of the single isotopic measurements of the K.