... with back light,RS 232 output, test at any angle, even upside down, for most metals. Portable hardness tester Features:* Large LCD ... special applications* Test at any angle, even upside down* RS 232 output and internal memory in a bath of 1250average readings ... , type of impact device connected, memory. reference, date,time,battery power consumptionDisplay 128 x 64 LCD display with back lightAccuracy ...