Does anyone have any tips on using ready reckoner?

Ready Reckoner or electronic calculator ? This appears to be a general question and does not relate to a trade question - but these can be used for conversion and measurement criteria, calculations for example referring to geometrical solutions can be worked out electronically or applied formulae. One notable example stands out as the formula for 3/4/5 squaring, the Pythagoras Theorem, for establishing right angles, Sq. on H. = sum of sq. of other two sides of a right angled triangle. Hope this will be some help.

Hi Stephen, It depends on how accurate you wish to be? The 3/4/5 rule has served me well for many years and I even remember going around site with my book of tables in the toolbox just in case. Now I would not be without my Bosch GLM80 for measurement. It does most of what you describe. It takes care of most measurements and conversions on site and is much quicker than using a tape so more time to spend talking to customers about what they want? And yes, I do have a scientific calculator as well. Call me a belt and braces guy?