The W5746 uses ultrasonic or laser technology (model dependent) to calculate distances by measuring the time it takes for a signal to bounce off a solid object and return to the sensor. Typically 2ft to 50ft (0.6m to 15m). Accuracy: +/- 0.5% to 1% of the distance. Power Source: 9V Battery (not included in all kits).
Use this to measure height where you cannot reach the top (e.g., ceiling height). Point-N-Measure Digital Tape W5746 User Manual
Finally, a contact information section for customer service and warranty details. The W5746 uses ultrasonic or laser technology (model