Check the batteries! Battery failure is often the common cause for the sensor or instrument failure. Simple to use, portable universal battery tester for the standard and rechargeable batteries.
<ul>
 	<li>Easy-to-read color-coded display with “good,“low and “replace/recharge indicators</li>
 	<li>Works with standard and rechargeable batteries</li>
 	<li>Compatible with: 9V, AA, AAA, C, D, 1.5V button type</li>
 	<li>Compact design</li>
 	<li>Ergonomic battery holder</li>
 	<li>Users manual included</li>
</ul>