Specifications: 254nm shortwave and 365nm longwave UV lamp for fluorescence detection on stamps and banknotes This longwave lamp reveals fluorescent and colored bands on GB stamps (refer to illustration for blue and yellow). It is also effective on stamps from Australia, Canada, China, France, Germany, Hong Kong, Mexico, Norway, and Russia. The lamp can detect different paper types such as OCP, FCP, PCP, and ACP. For optimal results, use in a dimly lit room against a dark background. This handheld portable model requires 4 AA batteries (not included). Shortwave Lamp: The shortwave lamp clearly shows phosphor and phosphor afterglow on GB stamps up to 1992. For best results, use in a dark room—the darker, the better. To observe different colored phosphors on the 1960 Wildings issue, look for the afterglow effect when the UV light is turned off. Green phosphor has the brightest afterglow (10 seconds), followed by blue (15 seconds), while violet has a very short afterglow (5 seconds). Afterglow is difficult to see in daylight; a dark environment is recommended. This handheld portable model requires 4 AA batteries (not included). Condition: 100% Manufacturer: China Package Included: 1 x 365nm longwave UV lamp 1 x 254nm shortwave UV lamp Note: 1. Please allow 1–3 mm error due to manual measurement and 1–3g weight variation. Ensure you are comfortable with this before ordering. 2. Due to lighting conditions during photography and monitor differences, images may not reflect the actual item color. Please confirm you accept this prior to ordering.