Portable and handheld spectrometers bring detection and identification capabilities off of the bench and out of the lab, enabling research to take place in the field, quality control to take place at the loading dock and instruments to be taken right to the sample rather than vice. Portable and handheld spectrometers bring detection and identification capabilities off of the bench and out of the lab, enabling research to take place in the field, quality control to take place at the loading dock and instruments to be taken right to the sample rather than vice. SERS-enhanced handheld Raman enables ultra-trace fentanyl detection on nanostructured substrates, supporting diluted test-strip workflows that reduce exposure risk during presumptive field screening. Handheld FT-IR provides rapid vibrational fingerprinting for food-fraud detection across supply. Handheld spectrometers operate on the same fundamental principles as their larger counterparts: they analyze how light interacts with a sample to determine its composition. These devices utilize the interaction between light and matter to identify and quantify various chemical compounds. Many industries rely on accurate material verification to prevent. Recent advancements in handheld mass spectrometry have revealed its ability to deliver accurate and rapid results. This technology often integrates with software for data analysis, enhancing user experience and functionality. Studies demonstrated its use in on-site drug testing and toxicology.