This instant sterilizer enables small instruments to be disinfected and sterilized within seconds directly where they are used. Especially suitable for laminar flow devices. Biological investigations and tests prove that the constant temperature of 250°C in the glass bead container reliably kills all micro-organisms and spores within a few seconds. That part of the instrument which is immersed in the STERI glass beads is sterilized. The STERI 25, 250 and 350 are three sizes with the same design: a glass bead container made of chrome steel, a powerful heating element for short heating times, a precision thermostat, and a temperature limiter with built-in thermometer.