With a 30:1 optics ratio, the measurement spot diameter at a distance of 1 meter is only 36 mm. This means that even smaller objects, such as yogurt cups, can be conveniently measured from a distance. A 2-point laser marking accurately displays the diameter of the measurement circle, which helps avoid measurement errors. With two measurements per second, the Testo 831 is fast enough to conduct scans on pallets or refrigerated shelves in a short amount of time. The user can set an alarm threshold that is continuously monitored during measurement, providing acoustic and visual alerts in case of over- or under-threshold conditions. This allows for quick and easy identification of defective products. The clear, large display is illuminated, ensuring that values can be read perfectly even in poor ambient light, such as in storage rooms. Typical applications include rapid temperature tests during incoming goods inspections, in freezers, in refrigerated shelves, or in production at butcher shops, bakeries, food manufacturers, or supermarkets.