Super PAP Pen Liquid Blocker
New and improved. The Super PAP Pen Liquid Blocker outperforms the original PAP Pen. The Super PAP Pen may be used at temperatures as high as 49°C. (The old style PAP Pen worked only up to 32°C). With this high temperature feature, one can now use the Super PAP Pen to perform the peroxidase-anti-peroxidase method, ABC method, and Fluorescent antibodies method with satisfactory results.