These illuminance meters provide measurement functions that include illuninance (LX), illuninance difference (LX), illuminance ratio ( percent ), integrated illuminance (lx-h), integration time (H), and average illuminance (LX). meters feature a silicon photocell receptor that provides highly accurate measurements and includes a USB port for easily downloading measurement data. Use the optional software to import your measurements into Excel for report generation and analysis. Illuminance meters provide highly accurate and reliable measurements conform to Class AA JIS C 1609-1: 2006; and DIN 5032 part 7 Class b standards. Provides multi-point measurement capabilities – 2 to 30 points. Accurately measures controlled light sources. Model t-10ma includes a min receptor for small hard to REACH places. Easy-to-read LCD display.