... *0.7-12mm; big sample:3-10mm*3-12mm;Time for test: more than 1000/3 minute; ( it's based on level ... working time: More than 5 hours Model difference: UFL-019A: for small sample and middle middle, such as rice, wheat, vegetables ... , flowers, tobacco seed. UFL-019B: for big sample such as corn, bean, sunflower seed UFL-019C ...