Tool for removing the air filter on your VISO II, OPTIMA II, or SOLO II
If your L&B altimeter/audible spends time in the pond, it is a very good idea to replace the Filter. Our audibles/altimeters are water-resistant but it is advised to replace the filter after a dunk in anything but clean water (including pond water, salt water and any other pond that has debris of any kind).
Replacing the filter is easy but requires a special tool. Attempting to remove/replace the filter without the tool is NOT advisable and could damage your audible/altimeter.