The batteries won’t fit in my TW9000 digital line tracer. I can’t close the battery door or screw on the battery cap. What should I do?

Answer: Make sure you're using high-quality D-cell batteries from trusted brands like Energizer, Panasonic, Duracell, or Amazon Basics. These brands are made to standard size and will fit properly. ⚠️ Avoid using off-brand or some imported batteries, as they can be slightly too large and may not fit in the battery compartment.