A California manufacturer has made a big change to the carpenter's level. Now it's electronic. Instead of reading a bubble between two lines, you read a liquid-crystal display (LCD)--a 1/2-inch-high version like that on a digital watch. This new level still indicates level and plumb, but it also measures all the angles between. If you hold the level in front of you and rotate it in a full circle, it reads each degree. It also can show the measurements of an incline in percent of slope or inches per foot of rise. The LCD can even simulate a bubble. TOUGHER THAN IT LOOKS The manufacturer's engineers have tried to destroy the level. After doing legitimate laboratory impact tests, they went outdoors to their asphalt parking lot and flung five levels as high in the air as they could. When they picked them up, each one was intact and worked fine.