<p><a href="/photodb/user?user_id=8521336">rajmohan</a>--the very first thing I'd suspect is contacts. Both in the battery compartment itself and around the meter head itself. I've had good luck in using some sort of mild abrasive--like a pencil eraser--on the battery box contacts--and gently-- VERRRRRY gently--bending the spring contact in the bottom upward. Very gently! It WILL break! Second, remove the meter head itself and clean the contacts where it fits onto the body. Lastly, put new batteries in and leave the meter on for a while--several hours--that recharges the capacitor that lights up the meter. Good luck!</p>