Black decker instructions marksman - Black & Decker Distance Measurer with Sensor, Marksman

While holding the stud finder on a spot on the wall where you assume there is no stud... press the button and hold and stay still for 10 or 15 seconds to calibrate. Then while still pressing the button start sliding sideways until the lights indicate the thickest point. You can use a pencil to mark the beginning and end. The center of that is the center of the stud. Measure 3/4 of an inch left and right of it to know it's sides.

I don't know how to use this my husband passed on and I wanted to use this for measuring rooms which side buttons do I use

http://www.blackanddecker.com/Manuals.aspx

http://servicenet.blackanddecker.com/Products/Detail?productNumber=BDSM100#

Hello. The user manual can be found at this link for free download.

http://servicenet.dewalt.com/Products/Detail?productNumber=BDSM400

If this helps, please rate a four-thumbs up. Thank You.

mine does that when battery is low or red light not bouncing back

Hello. The user manual can be found at this link for free download.

http://servicenet.dewalt.com/Products/Detail?productNumber=BDSM400

If this helps, please rate a four-thumbs up. Thank You.

Hello. The user manual can be found at this link for free download, it should solve this issue.

http://servicenet.dewalt.com/Products/Detail?productNumber=BDSM400

If this helps, please rate a four-thumbs up. Thank You.

If you take a tape measure and step from the wall at exactly 10 feet, you will be able to turn the calibration knob to the same exact distance. All other distances from that point on will be precise. Thank you, Dana

http://www.dewaltservicenet.com/documents/English/Instruction%20Manual/624090-00,BDCAL100.pdf