portable laser distance meter features:● measurement time: single measurement 0.3 second/time, continuous measurement  7 times/second.● Automatically store the measured values, it can record 10 group of data. All the stored values including each single measurement and the final calculated results can be reviewed.● The stored measured values can be performed Added/substracted measurement.● The measured Area/Volume values can be performed Added/substracted measurement  .● Power supply: 2*1.5VV "AA" LR6 Batteries.portable laser distance meter specifications:Model:FL-40MMeasuring accuracy±1.5mmDisplay accuracy1mmLaser levelClass IILaser type630~670nm,< 1mWArea/Volume measurement function√Pythagorean proposition measurement function√Add and subtract measurement function√Continuous measurement function√MAX/MIN√Multi-line Backlight display√Buzzer√Storage10 groupsDust and Water proofIP 54Operation Temp. Range0 ℃~ 40 ℃/32℉~104℉Storage Temp. Range-20℃~70℃/-4℉~158℉Battery Life5000~ 8000 timesBattery Type2 * 1.5V  "AA"  LR6  Auto Laser Off 30s Auto Power Off Approx. 80 seconds Size118*53*26mmWeight225gportable laser distance meter pictures:Recommendations:Pen Type 30m Laser Distance MeterHigh Qualtiy Digital Sound MeterMini Pocket Temperature And Humidity Meter