A small, lightweight alcohol checker capable of measuring alcohol concentrations from 0.05 to 1.00 mg/L. - Model Name: AT-03 - Function: Alcohol check function - Measurement Range: 0.05 to 1.00 mg/L - Alarm Function: Warning at 0.16 mg/L or higher - Size: Small and lightweight - How to Use: Breath-in method Although new and unused, the box was torn when it was opened once. Please check the images. Thank you for viewing.