Keysight technologies u1210 series handheld current clamp meters keysight technologies u1211a opt abd the u1211a handheld current clamp meter from keysight technologies is capable of tackling high current measurements on electrical distribution cables up to two inches in diameter without breaking the circuit unlike many clamp meters these include dmm capabilities resistance capacitance frequency and temperature they also provide an extra layer of protection with cat iv 600v and cat iii