The Faithfull Jenny Caliper is a fixed joint marking tool designed for accurately locating the centre of round or square steel sections. Also known as hermaphrodite calipers, this versatile measuring instrument features a unique offset design where the adjustable point leg is positioned opposite the straight leg containing the locating lug. This specialised caliper is ideal for metalworking applications where precise centre marking is essential, such as preparing stock for drilling or machining operations. The fixed joint construction provides reliable stability during use, whilst the 150mm (6in) range makes it suitable for marking a variety of common workshop materials. The offset leg design allows tradespeople to mark centre points on cylindrical bars, round stock, and square sections with consistent accuracy. Whether you're a machinist, fabricator, or engineer working with metal components, this jenny caliper delivers the precision needed for professional quality results. Features a