Versatile Three-in-One Single Beam Visible Colorimeter for Undergraduate Chemistry Laboratories

In this work, we have developed a versatile three-in-one single beam visible colorimeter for undergraduate laboratory courses. The battery and mains electricity supply (utility power), wired wireless data logging, 3D-printed components are three important highlights of the colorimeter. system is based on low-cost ARDUINO UNO microcontroller can measure absorbance liquid samples in region electromagnetic spectrum. For on-field measurements, present work small 9 V battery. Therefore, portable be used different field studies. addition to this, also benchtop measurements. measurement results displayed an OLED display or recorded using open-source acquisition tool personal computers/laptops. measured transmitted Bluetooth module Android phones. application was MIT App Inventor web application. rapid prototyping system, all designed 3D-printing technology. functioning tested by measuring aqueous KMnO4 K2Cr2O7 samples, experimental were compared with commercially available difference between commercial spectrophotometer less than 4%, suggesting satisfactory performance students use understand some basic concepts