Hirmas with Laser (IMAGE) American Society of Agronomy Caption Hirmas uses his MLT scanner at night in a soil pit. Ambient daylight interferes with the detection of the pores. Cooler night temperatures also allow the scanner to stay cool and minimize the evaporation of water from the surface during the scanning procedure. Credit Photo provided by D. Hirmas. Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.