STSJ89-200D Four arm caliper logging tool can realize up logging and down logging, and does not need to close the caliper arm until the logging finishing, convenient operation and save time. The balance piston device of the STSJ89-200D four arm caliper logging tool can effectively protect all the key parts of the instrument, so that the damage to the instrument can be minimized, thereby reducing the maintenance cost and improving the success rate of logging.

Adopt the design of lantern body split type four arms caliper mode, the measurement can be more accuracy and the operation can be more safe and easier.

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