Keysight technologies u1250 series handheld digital multimeters keysight technologies u1252b opt abd 902 the u1252b handheld digital multimeter from the keysight technologies u1250 series is fitted with the same functions as the u1251b but also has a 20mhz frequency counter and an integrated rectangle generator almost every measurement can be read quickly and reliably because of the 50 000 digit lc display with analogue bar display and adjustable background lighting in addition the u1