... design, built-in battery for portable measurement widely used in petroleum, chemical, power, pharmaceutical, commodity inspection, scientific research, ... dimethyl butadiene, benzene, toluene,xylene, ethyl toluene, dimethyl styrene, tetradecene, petroleum ether, cyclohexylamine, methylcyclohexylamine, cycloheptane, ethylene cyclohexylamine, dicyclopentadiene, dimethylnaphthalene, trimethyl styrene ...