GB Castle High values with Inverted water mark? They catalogue much higher than the normal versions. This electronic tool can help you spot water mark rarities in your collection. The Signoscope is capable of displaying the watermarks on all stamps without using messy fluids/inks. Clean easy and 100% efficient. You just put the stamp in the machine and press a button.

The Professional model has a brighter bulb, an adjustable brightness control and lever mechanism to enable quicker changing of stamps being viewed.

Mains adapters are supplied but are the continental 2 pin type (For use in Germany) and will require an adapter for the UK mains system (Shaver type to UK 3 pin) The Signoscope can also run on 5 'AA' batteries or 2 'AA' batteries for the smaller T2 model. Batteries included!

All electrical products come with a full year parts and labour guarantee and can be returned in the event of malfunction for a replacement. Below are some actual pictures of watermarks exposed by the Signoscope, on German stamps.