Pin: 30-60 mm
Coin: 75-100 mm
Six inch cutter: 160-10mm
20MM Steel ball: 180-195mm
Simple and convenient to use, no adjustment is requiredThe detection distance will not be changed when the battery voltage drops from 9V to about 7VLow power consumption, can work for 40 hours continuouslyThere is automatic and continues alarm when the battery is used up