This is a black anodised aluminium humidity Indicator plug with an alochrome thread for R.F. screening continuity and has a glass window.
It is furnished with a gasket, gasket retainer and hex back nut. It may be installed in a container through a 0.515 in. (13.1 mm) diameter hole.
For optional single or multiple spot discs please contact us.
We also supply a service kit as we recommend the humidity indicator paper be replaced every 3-5 years.