... for Water heater2.Advantage:Fine workmanship, surface no scars, bright color and lustre, competitive price, Eco-friendly products.3.Application:Water heater ... 9.Inspection tooling:Outer micrometer, inside micrometer(machine),digimatic micrometer, internal micrometer, mechanical caliper ... , vernier caliper ,caliper(digital),caliper(machine),caliper(dial),diameter scale, depth micrometer, digital ...