Stanley Intellimeasure Distance Estimator, 77-018: * Length: 10" * Allows 1 person to measure up to 40" without assistance * Intuitively designed toggle button features 3 measuring modes: length, area and volume * LCD displays last 3 measurements for quick reference * Choose between English or Metric modes * Large, easy-to-read LCD screen * Accurate measurements (+/-0.5 percent) you can rely on * Automatically calculates area and volume * Manual addition mode for specialized calculations * Requires 9V battery (not included) * Limited lifetime warranty