The popular Metaclamp® is now available with a fog/condensate free option. A built in heater keeps the temperature of the sight glass above the point where condensation and fog can form on the inside and outside of the sight glass (similar to a defogger on the back window of a car). Heating element requires a 24 Volt supply with either a temperature controller or timer to regulate the heat. Thermocouple is included. Described as offering the optics of glass and the strength of steel, Metaglas® provides a level of safety, and a useful service life, well beyond that provided by conventional tempered glass or plastic in sanitary service. Even at the most extreme temperatures (as high as 536° F) or in overpressure situations, sudden, total failure – that involving leakage or explosive shattering of the glass – essentially never occurs.