That one is OK for a low power beginners Pulser. But if you want one with twice the power (equal to the professional Sota unit) then click here and buy the plans for $10. Becks original do-it-yourself Pulser output around 24kG magnetic strength. The plans previously mentioned are for a Pulser that only output 12.3kG. A Pulser made by my plans outputs 36.8kG.