Keysight technologies u1250 series handheld digital multimeters keysight technologies u1253b opt abd 902 the u1253b handheld digital multimeter from the keysight technologies u1250 series has the same functions as the u1252b but also has an oled display with a crystal clear view even in dark ambient light and at almost every viewing angle keysight technologies u1253b digital multimeter 50000 counts