Discover the secrets of your stamps! With the SHERLOCK watermark detector, you can reveal every detail of your stamps, including watermarks, paper irregularities, quality defects and repairs. Using the detector is easy: Insert the stamp, turn on the light, and you can already see the secrets of your stamps in every detail. With no use of chemicals, there is no danger to your stamps. The special feature of this watermark detector is the different light colours (white, red, green and blue), which can light up your stamps in different ways. The brightness is also adjustable. Reveal hard-to-find watermarks with this wide spectrum of colour and brightness. The SHERLOCK watermark detector brings professional features in a compact form factor. Suitable for stamps up to 50 x 45 mm (6 3/4 x 4 3/4 ) in size. Battery-powered (4 x 1.5 V AA batteries). With an extra-strong plastic case. Overall size: 93 x 130 x 150 mm (3 5/8 x 5 1/8 x 5 7/8)