its very very useful product, also actual as describe, quality is also good. fast shipping received very much before time.
Its working fine I used 800 watts microwave oven transformer I used 16sq mm wire 3 rounds in the primary part Neutral wire you connect directly to transformer but Line wire must connect to this pcb T1 holes then from T2 holes goes in to the transformer Now I started doing spot welding with 18650 battery