Stainless steel rulers are very handy bits of kit. This year, finally, I’ve got hold of two steel rulers with the perfect design.
I’m a BTO bird ringer and carry out Barn Owl monitoring every year. The feather measurements are tricky, because ‘standard’ rulers have a stub with no graduation marks, a few wasted millimetres that don’t measure anything! The stub gets in the way. I use the feather measurements to the nearest mm to match up to standardised age estimates.
My new steel rulers are specially designed, with the end clean-cut, and no useless stub!
Now I can place the ruler’s edge exactly into the unfurling part of the feather I need to get an accurate length. The same goes for measurements of anything you might encounter on field studies, such as shells, plants, small mammals, etc.
These rulers are perfect, and weren’t easy to find, so I got hold of more!
You can buy these from me, at a better price than you’ll see from BTO ringer sales or most biologist / naturalist equipment suppliers. I have listed these 15 cm and 30 cm steel rulers for sale on my ebay gallery.