Tools and Instrumentation Archives

Video Spectral Comparator (VSC): Principle, Parts, Uses, Advantages and Disadvantages

Tools and Instrumentation, Questioned Documents

The Video Spectral Comparator (VSC) is a UV-Vis-IR imaging spectral device designed for forensic examination and authentication of questioned documents. It was developed by Foster and Freeman. A basic VSC unit consists of a high-sensitivity camera, different light sources, a software/viewing interface, and a positioning stage. The built-in multiple spectrum sources can reveal hidden characteristics …

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Electrostatic Detection Apparatus (ESDA): Working, Principle, Procedure, Advantages & Disadvantages

Tools and Instrumentation, Questioned Documents

Electrostatic Detection Apparatus (ESDA) is an electrostatic detection device (EDD) specifically made by Foster and Freeman Ltd. to reveal indented writings on a paper surface. With time, ESDA become synonymous with EEDs for detecting indented writing or marks on forensic questioned documents. Moreover, it offers a non-destructive nature of detecting indentation because it operates on …

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Forensic Rulers and Scales: Types, Characteristics, and Uses

Tools and Instrumentation

You have to have accurate measuring tools, such as rulers, gauges, and grids for precise measurements in the forensic application. But… Number of Options!! Thus, you should know what to choose. Honestly, I recently made a wrong purchase— a digital product. I just lean down and make a purchase, compulsively. That ended in a product …

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