Shenzhen Tianzhi Technology co., Ltd. We are a great instruments supplier from Shenzhen, China. We have Colorimeter, Spectrophotometer, Glossmeter, Hazemeter, Oscilloscope, Digital Multimeter, DC Power Supply, Spectrum Analyzer, Signal generator, Test accessories and so on, have a great price advantage.Brand: Hantek, CHN Spec, 3nh, Rigol, Itech, Quick etc..