H-D-Gln-OH,5959-95-5 Mianyang Shengshi Health Technology Co.,Ltd , https://www.shengshiaminoacid.comThank you for choosing Myron's latest generation of advanced portable UltrameterTM 6P multi-parameter water quality detector. This instrument will make your operation very simple and convenient. For the sake of convenience, there is a simple introduction at the bottom of the instrument and a pocket card with simple operation instructions of the instrument.