OPPIOT Technologies Co., Ltd according to market very specific requirements of Manhole cover management ,developed this Special tag OPP5427 Manhole Cover RFID tag ,which should be Installed inside the manhole cover.And we can read the RFID Tags without opening the cove and know its real -time status of lost Manhole cover . The reading distance can reach 1.5m by hand held reader .
The material of tag is PPS., which has strong water-proof . the can be used under -30℃ to +100℃ .The tag are with acorrosion，vibration resistence ,and it is easy for maintenance.
More info see the link :http://www.oppiot.com/RFID-tag-for-manhole-cover.html