Deff recommended to not go below 1.3. I've seen on here ppl going little lower than .9 but I'm sure it has to do with aloe more than I know like if it's actually drawing the correct watts or volts etc. i dont know. I do know if you've found out i want to know how low the svd will read a coil because I'm lazy and poor and running out of kanthal and won't have an ohm checker for two more weeks lol