Accessories. Test Box. Ident. no.: 6967113. Universal test device for different sensor types.. Analog sensors current/voltage. 3-wire DC sensors (npn/pnp). Function test without dismounting the sensor. User-friendly display and control elements. Powered via 2 batteries, type E-Block 9V or 24 VDC external supply. Analog test box. Test box for sensors with analog or switching output