"Just fitted a large flat with trunking for 6 smoke alarms using this in combination with a cheap bevel gauge and chop saw. Beautiful, spot-on mitres every time. It saved me hours of inaccurate fiddling with mitre blocks when everyone knows that buildings never have exact right angle corners. Yes, as an earlier reviewer stated, the numeric angle read-out is wrong but that doesn't matter if you don't need to know the number of degrees, just the position of the half-angle to set your chop saw. Love this gadget."
"This is an excellent tool,i bought this as i have just recently moved house and renovating it from top to bottom.I used it to get the angles for my new skirting board going into the bay windows/area.It works a treat and makes it so easy, i would recommend this."
"I purchased this item to assist me in calculating angles in bay windows (I'm a curtain fitter). Works well and, with a slight modification and basic geometry, it measures internal and now external angles a little easier and reliably. Overall, an inexpensive, reliable and easy to use tool."
"This is a good tool but, as stated by other reviewers, the scale is not accurate. This means that you either have to set you saw directly from the tool, or you have to measure the angle with a protractor to use the saw's scale.
If you want to calculate for compound mitres then you have no choice but to measure the angle from the divisor using a protractor.
It's a real shame because it costs no more to make a tool that's accurate, it's just a lack of rigour in design and production."
"Nice and simple to use for internal mitres, however, contrary to the description it does not do external corners. It will be okay if you can fit the tool over the external corner, say as in a box but not an external wall angle. To do this you would need something like a sliding bevel to get the external angle first."
"This is a well designed tool very close to being ideal for measuring internal angles and setting saw angles. It is well made of good materials - unfortunately the scale is plain wrong and it goes from bang on at 90 degrees down to 3 degrees wrong at 45 degrees.
It is a great shame because it could easily be solved by calibrating the scale properly but it is completely useless as it is."