You can get the latest version of Proximity Sensor by opening the Market and searching for "Proximity Sensor". Developing and maintaining applications costs money, please consider donating by clicking the Donate button or buying the donate application from Market

Alternatively if you have a barcode scanner you can use the image below:

You can also download it here:
v1.4
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v1.3
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v1.2
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v1.1:
Download

v1.0:
Download