I bit off the screw with 2mm wire cutters. do it on a table with a dark tablecloth, roll, fall, screw, hell, you will find one. Away from children and cats. The wife will kill the battery. Its pros: A large indicator can be seen where there is no access and you can’t crawl on an outstretched hand. It measures the depth perfectly. I checked everything with a micrometer to hundredths. Different cons: ATTENTION! the screws of the battery cover are long. When fully screwed, one screw shorts the central contact of the battery to the case on the board under the screw. The indicator goes out.