This is a larger-sized clear anodized aluminum Humidity Indicator Plug.  It may be installed in a rigid container through a 1.45 in. (37 mm) diameter hole.  Lock nut and gasket are furnished.  Comes with a 20-30-40-50% disc, which is field replaceable with a 1.188 in. by .050 in. (30 mm x 1 mm) flat steel blade.  NSN # 6685-00-989-5312. 

Also available with black anodize finish as TA398-2345S.  Meets MS18013-2.

Weight: 0.09 lbs. (41 grams)

TA396 is appropriate for use on NEMA 1, 2, 3, 3R, 3S, 4, 5, 6, 12, 12K, and 13 enclosures, as well as IP66/IP67 enclosures.  This item may also be appropriate for use on other NEMA or IP enclosures, depending upon the application.  Contact AGM's Engineering department for more information.