DIGITAL ANTIBIOTIC ZONE READER

DIGITAL ANTIBIOTIC ZONE READER determines strength of antibiotic materials by measuring diameters from 0 to 80.0 mm of inhibited zones in Petri dishes. Light from base passes up through transparent and semitransparent portions of agar. Adjustable rubber belt sliding,facilitates positioning of dish relative to light source. Light then passes to reflecting mirror which reflects image on Viewing Glass. Arc from one edge of circle zone is adjusted tangent with line on grounded glass by the Slider Knob ZERO switch on the front panel to get the reading Zero on digital display. Then Entire dish is to be moved by turning Slider Knob until arc from opposite side of inhibited zone is brought tangent to same line. Take down the reading from the digital display.