เครื่่องวัดระยะทาง Distance Meter เครื่องวัดพื้นที่ ปริมาตร รุ่น AR831

Function:
1. Measures in imperial/metric
2.Star point selection
3.Computes areas and volumes
4.Sum of lengths.
5.Auto/manual shut-off
6.LCD backlight
7.Low battery warning
8.Key sound, beeps for wrong reading finding and reading confirmation.

Requirement of measurement :
Ultrasonic technology is adopted in this unit so the unit should be hold toward the surface of ther object to measure at a rectangular angle.
To assure the accuracy that rectangular angle should be controlled less than +/-5% deviations.
For rough surface subject, this unit can't reach precision measuring stated in this manual.

Specification: 
  Measuring rang settings: 0.3m--1.5m (10 inch--50 feet) 
  SET: Switch measures from front or rear of unit. 
  M/Ft: Switch measures in metric/imperial. 
  Accuracy: +/-1% of reading.
  Response time: 2 sec 
  Power supply: 4 * AAA batteries 
  Stand-by current: 50uA 
  Before measuring current: 10mA 
  Operating current: 45mA 
  Auto shut-off: 60 sec(approx)
  LCD backlight: active in 6 sec(approx) 
  Operation environment temperature: 0 --40 degree celsius. 
  Humidity: 45%--90% 
  Store temperature: -10 to 60 degree celsius
  Dimension: 54*100*27mm 
  Weight: 200g(with battery)