Sensor tester Suitable for: pnp, npn and push-pull sensors No-load current (max.): 40 mA Output voltage: 18 V DC Protection class: IP 21 Connection: quick-release socket Current limit: 60 mA when operated with battery, 240 mA when operated with external power supply Power supply: 1.5 V batteries type AA (3x), external 12 V DC power supply (optional)