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"It is not attached to the rifle and is slower to use, it is also difficult to hold the rifle on target and hold and read at the same time.Also requires you to figure the cosine. The cosine indicator is simpler to use and the cosine is giving to you not the angle which makes it much quicker to use. The cosine indicator is worth the cost in my opion........ "

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A true cosine would be meaningless to the average guy. That's why the reading in percent just like the ACI gun mounted tool does would be so handy. The electronic measure with the hold button potentially would be more accurate. The other simple angle finders require two people to read it. One to aim it, the other to read it. The electronic one you could use by yourself just like the ACI unit but is much cheaper and handier to get a quick reading.

The term cosine is misleading. It really indicates percentage from 90 degrees to level. Example

A reading of 76 percent from the ACI or the Craftsman tool applied to 15 inches of elevation correction would be .76 x 15 = 11.4” correction for the shot.

A simple angle finder requires the addition conversion. 68.4 degrees on the angle finder would be converted for the shot. 68.4 / 90 = 76 percent x 15 = 11.4”

The reading in degrees from the angle finder is still going to have to be converted with a calculator to percentage. Now tell me just what 73 percent of 18.4" inches of drop is while your holding your rifle on target. Do you have a calculator or a palm pilot with ExBal mounted to your rifle too? No matter how you do it, you still have to put the gun down to do the calculations. Why swing that bulky rifle up for an angle reading?