The compact NanoPhotometer® product line (dimensions 20x20cm) has a built-in rechargeable battery, which allows measurements of up to 8 hours without external power connection. The device can easily be controlled via the integrated touch screen, a PC, smartphone or tablet. Compared to other technologies, the large concentration range from 1 ng / μl to 16,500 ng / μl (dsDNA) is realized over only two defined path lengths with fixed stops (True Path Technology™). The sample is compressed (Sample Compression Technology™), which makes it possible to accurately measure even the smallest sample volumes (0.3μl) with low surface tension. The devices are maintenance-free and recalibration-free over their entire service life.