HANDY TYPE NEEDLE DETECTOR MODEL HN-30 DETECTION METHOD Magnetic induction Hi： φ0.8mm steel at 5mm height from detecting surface DETECTION ABILITY Low φ1 .0mm steel at
HANDY TYPE NEEDLE DETECTOR MODEL HN-30 DETECTION METHOD Magnetic induction Hi： φ0.8mm steel at 5mm height from detecting surface DETECTION ABILITY Low φ1 .0mm steel at