For the most demanding of situations, the Fluke 117 hand held digital multimeter is the choice for you. It's no coincidence that professionals testing in commercial settings, hospitals, and schools look to this meter. The 6,000 count display updates 4 times per second, and has a large white LED backlight for low light conditions. The bar graph has 33 segments and updates 32 times per second. The installed 9V battery averages 400 hours without use of backlight. With VoltAlert technology for non-contact voltage detection and a 3 year warranty, the 117 will be in your arsenal for a long time.