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By certification 
Description
Specifications:
ZY-S1's pipeline crawler is Chinese top 3 crawlers
ZY-S1''s pipeline crawler has magnetic control syste
Feature:
Locate accurately
Performance good while welding machine working
Get back itself while meet with water, over-voltage, over-current, and over-heat
If under low powler, or without signal within 30mins, the crawler will get back itself
X ray densityis consistent even under low power
Acid lead bettery, can store 30% more energy, and resist higher temperature and avoid explosion
Specifications:
ZY-S1's pipeline crawler is Chinese top 3 crawlers
ZY-S1''s pipeline crawler has magnetic control syste
Feature:
Locate accurately
Performance good while welding machine working
Get back itself while meet with water, over-voltage, over-current, and over-heat
If under low powler, or without signal within 30mins, the crawler will get back itself
X ray densityis consistent even under low power
Acid lead bettery, can store 30% more energy, and resist higher temperature and avoid explosion