Involvement:General (knows how to use it) - Ownership:more than 1 month
Accurately measures distances (although can be off my 1mm at times )
Comes with good clear English instructions
Easy to use
It can so simple calculations like volume & area and addition & subtraction
Will not measure accurately inside cabinets (or really confined spaces)
Will get an error reading when using it on distances less than 40cm
Cannot measure between fence posts as the posts are too narrow to bounce back the ultrasound - has to be a solid flat object like a wall
It takes a 9v battery (unlike what is shown in the picture)
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