This sensor can detect the presence of a highly reflective object at 10cm. For less reflective objects (like hands) the distance is about 5cm.

Comes packaged with a 60cm Sensor Cable.

Product Manual

This sensor connects to an Analog Input on the 1018 PhidgetInterfaceKit 8/8/8 or on the 1202 or 1203 PhidgetTextLCDs.