BT-9300Z is an intelligent dual lens particle size analyzer which adopts integrated design, and all of operations can be completed automatically under control of the computer. It has particular functions of auto test, auto alignment, auto water supply, auto drainage, auto bubble removing, auto cleaning, etc. Adopts high performance semiconductor laser and life time is greater than 25000 hours; adopts anti-dry ultrasonic dispersing technology, so opening ultrasonic will not damage the instrument when circulating pool without water. The instrument has outstanding characteristics of accuracy and good reliability, good repeatability, convenient operating, fast test speed. It is a new generation of particle size analyzer which integrates technologies of laser, computer and photoelectron, and especially suits laboratories of enterprises, colleges and universities as well as research institutes to use.