sf6 relay also has electric contact, which doubles as density relay. They are dedicated meters for measuring SF6 gas.

, and manufactures better gas density monitors in the market depending on advanced equipment.

ZMJ60XD Density Monitor

ZMJ100PRO Fiber Optic Remote Transmission Density Monitor

ZMJ60R Remote-Transmission Density Monitor

ZMJ100PF Series Density Monitors

ZMJ100PRDH Density Micro-Moisture Integrated Collector

device used to measure pressure of gas