diverdoug1
Contributor
I knew someone would make this point. Nice try. Yes, accuracy vs. precision is well understood.
Most SPG gauges have 5 marks between each 1000psi marking, and a few have just 3 marks between each 1000psi, so even if they have high precision you cannot determine your exact pressure with any true accuracy. Look here: Scuba Diving Gauges with reviews on sale
So, do you want to estimate your tank pressure to the nearest 100-250psi or do you want to READ 855psi?
What you have said is exactly backwards. Precision is how closely secondary results reproduce past results (and is not reflective of accuracy). Example - a precise rifle has a very small 5 shot grouping (regardles of how close the grouping is to the targeted spot). Therefore, most SPG have lower precision than digital (with repect to the reading that is obtained visualy). Accuracy is how close the average result matches the intended result. Example - A rifle that sprays all over the target is still very accurate if the average of its grouping is very close to the targeted spot.
I have never seen a reliable source state that the average analog SPG is any less ACCURATE than the average digital SPG. That does not mean that it is not true. The two measure in two different ways (Bourdon tube, vs electronic pressure transducer. Just not sure if either is better. Never the less, as a fan of scientific method, i just wanted to clarify the accuracy / precision thing.
Last edited: