ProMinent DULCOTEST DT1B Operating Manual page 48

Technical Data
Ambient conditions
Water-tight
*measured with standard solutions
The specified device precision is only obtained when the original reagent
systems are used.
48
Temperature: 5 ... 40 °C
Relative humidity: 30 ... 90% (non-condensing)
similar to IP 68 (1 hour at 0.1 m); buoyant device