Check the listing for details. Lighthouse Sherlock - Watermark Detector. Condition: New. Listed at 302.67 USD. With the Sherlock watermark detector, reveal every detail of your stamps, whether it is watermarks or paper irregularities, quality defects or repairs. It is extremely easy to use; Insert stamp, turn on the light and you can already see the secrets of you stamps in every detail – no chemicals used, therefore no danger for your stamps. The special feature of this watermark detector is the different light colours (White, Red, Green, and Blue) which can be chosen to light up the stamp. The brightness can be infinitely adjusted. Reveal hard-to-find watermarks with this wide spectrum of colour and brightness. The Sherlock watermark detector: A compact device with the technical sophistication of a professional device. Suitable for stamps up to 50x45mm in size. Battery powered (4 x1.5v AA batteries). Extra-strong Plastic case. Overall size: 93x130x150mm.