We Jiangyin Spark Electronic(China) produce wide range of high quality Rogowski coils ,Split core Current Transformer with 0.333V ,1A and 5A output, and all kinds of hall sensors,with good quality and low price ,we have CE,UL,ETL certifications. we have many customers all over the world,we can produce custom made products and send you free samples,delivery time normally need 3 to 5 days, big order need 7 days. we have experience cooperated with big customers, who need more than 10K each month!!! our split core CTs, rogoswki coils are with good quality, approved by UL,CE,ETL certifications listed, used for energy metering/monitoring, for solar energy/home energy/building energy metering and monitoring. for more information, please visit our Website: www.action-ele.com or contact Johnson@action-ele.com,welcome your inquiry.