First, if you should have a bad day and drop your meter onto a hard surface or run over it with a car. Don't worry, it is probably okay. It is not out of calibration. If it hit very hard, then it is possible for the electronics to break, but not likely. And they can be replaced or repaired as necessary. If the switch on the bottom appears damaged, don't try to fix it yourself unless you are in the Gobi desert. All other deserts, please contact us. Do not attempt to disassemble this meter. It is virtually impossible unless you know what you are doing. This is not a challenge, only a warning. Don't take the dial off as that will get you nowhere.
Second, if you should drop the meter into a fresh water. See if there is water inside. Although Pocket Spot is not waterproof, it is fairly repellent and should dunk be brief, it may be fine. Dry off the outside. Take out the battery and see if there is water inside. If there is water inside, you will need to send it in for repair. Do not put the battery back in place. Again, if you are in the Gobi and have no email, rinse the meter with distilled water and dry in a warm place such as the sunny dash of you car or a vacuum chamber.
Third, if you should drop the meter into salt water. See above and if there is water inside, then rinse it several times, inside and out, with distilled, reverse osmosis, or de-ionized water. Leave the battery out and contact the factory. If you get it in time, there is hope.