HANNA INSTRUMENTS - HI770-25 REAGENTS SILICA HIGH RANGE Hanna Instruments Sale! from 3800 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Hanna HI770-25 Reagents Silica High Range Range 0 to 200 ppm 25 Tests Hanna Instruments HI770-25 Reagents Silica High Range