Compact measuring and display device for MAVOPROBE. The MAVOMASTER is a universal measuring and display device that can be used with any MAVOPROBE, forming a standalone measuring instrument. The MAVOMASTER provides power to the connected probe, detects its type, and displays the measurement values accordingly. The integrated measuring functions evaluate the measurement results and provide on-site assessments with the option to save in CSV format. They can be assigned as needed to the two function buttons F1 and F2 and include a data logger, relative measurement, grid measurement for assessing workplace lighting with calculations of Emin, Emax, Eavg, U0, and UD values, a ratio measurement B/A for contrast measurement, a deviation measurement B-A, a deviation measurement %A, and an integral measurement for determining the irradiation dose. Measurement values can be stored in CSV format in the 4 GB memory and read out via the USB interface. Grid measurement for assessing workplaces and indoor lighting. Extensive measuring functions: relative, integral, deviation, and ratio measurements. Recording of minimum, maximum, and average values. Data logger with adjustable logging interval. Large 4 GB measurement memory, readable via USB as an external drive on a PC. Continuous operation via USB with power bank, plug-in power supply, or PC. EXCEL macros for documentation and data logging. Probe connection: Binder socket series 711. Display: monochrome FSTN graphic display, 128x64 pixels, 50 mm x 25 mm. Controls: 6 buttons, fluorescent labeling. Power supply: 1 × 1.5 V AA type battery, continuous operation via USB interface. Interface: USB 2.0, Micro-B socket. Memory: 4 GB. Delivery includes: 1 x MAVOMASTER, 1 x 1.5V AA alkaline-manganese battery, 1 x USB 2.0 cable type A to Micro-B, length 1.0 m, 1 x EXCEL evaluation/data logger (download), 1 x user manual D/GB.