The 7911A2 is an easy-to-use zero-point source for calibrating temperature sensors. Features a Lower uncertainty zero-point (to ± 0.002°C uniformity). The bath has a 5 litre tank with a depth of 300mm. The stainless steel dewar is vacuum insulated and is used to give your ice-point realization longevity. Using pure distilled or demineralized water for bath fluid and ice, you’ll consistently produce a 0°C calibration environment with up to ± 0.002°C accuracy.