I thought about that too. I’m not sure if there is a way to check. The model number says it is supposed to be a 10 meter sensor. And the reading shows 9999 when the object is out of range. This is typical of the 10 meter models. I believe the 5 meter models show 4999 when out of range. Maxbotix isn’t sure what the problem is. They sent me an RMA to send it in and have it evaluated. Hopefully doing so finds the issue.