It's Here! Chris Odom's Physical Computing & Robotics with the Arduino IDE - Volume Two!

Analog Hall Effect Sensors

$1.50

I like the +/- 18mT. The +/-9mT has a steep response curve but is not really that much more sensitive at a longer range. It also plateaus in a wide range (see graph above). The +/-73mT is fine and likely the better choice if working in a very short range. See video below.

The DRV5053 device is a chopper-stabilized Hall IC that offers a magnetic sensing solution with superior sensitivity stability over temperature and integrated protection features. The 0- to 2-V analog output responds linearly to the applied magnetic flux density, and distinguishes the polarity of magnetic field direction. A wide operating voltage range from 2.5 to 38 V with reverse polarity protection up to –22 V makes the device suitable for a wide range of industrial and consumer applications. Internal protection functions are provided for reverse supply conditions, load dump, and output short circuit or over current. 

Full datasheet From Texas Instruments can be found here: drv5053.pdf