It found my leak, bad schrader valve but I was outside where I prefer to find known leaks and tilted the block to read the display and couldn't see unless the Block was shaded. This is normal as sounds intensify with visual cues. The device arrived fully charged, a little vague in the manual but enough to get you started looking. The unit has a preheat countdown timer and a ready tone that lasted less than 10 seconds. The wand is too big to fit in the vents I tested, but could fit under the case and in front of the vents, among other things. Now another tool for finding non-UV leaks in hard-to-see areas or when the system is full and out of dye. 1 star removed due to display in the sun.
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