I saw the raculator used once. I wasn't all that impressed with it. Its difficult to understand how it can be accurate since some of the measurements are taken from a wheel that spins. I don't understand how it could measure accurately since you could add or subtract inches by keeping the wheel in the same place on the antlers and rotating the body of the raculator. A cheap tape measure works just as good as anything else and there is plenty of info on the internet on how to measure.