Final answer:
Sensitive analytical techniques might introduce complexities by detecting irrelevant trace elements. Digital devices can enhance the accuracy of measurements by detecting smaller currents. Nonetheless, several factors can limit the accuracy of measurements.
Step-by-step explanation:
The sensitivity of modern analytical techniques can hinder the process of comparing items of physical evidence because sensitivity may detect trace elements that are not relevant to the comparison. Although sensitivity allows for more accurate comparisons, it may also detect substances or details that are not related to the criminal activity or instance under investigation, leading to potential complications or confusion in evidence analysis. Furthermore, factors such as resistance in wires, temperature variations, and user skill can limit the accuracy of measurements, whether null measurements or others. The use of a digital device more sensitive than a galvanometer can improve accuracy as it can detect smaller currents, making the null measurement closer to zero. However, any method, whether digital or analog, has inherent limitations.