Made in the USA the Proshot AS2 Magnum is a fully automatic Single Grade laser with Dual Grade capability. Each unit is individually tested over a range of temperatures to ensure that it will perform under all jobsite conditions. With a grade range of -25% to +25% in increments of 0.01% the AS2M has a range of 1km diameter with an accuracy of +/-1.5mm/ 30m or better. Add to this a compound slope adaptor and you have a laser that outperforms any competitive product in a similar price range.