I've dropped it, gotten it wet and dirty, and it stills does a great job. Just have to remember to change the tip filter regularly. It comes with wall charger and a car charger. The car charger has really come in handy.
Others may differ but this is, by far, the best leak detector I've ever owned.
I have the same one, it goes off when u expose it to a jog Of 410, But when i actually look for a 410 during a service call it rarely goes off even After i replaced the tip, how old is yours,ive had mines for about 6 years