code/Debug/Helper/Data.php
public function getModuleVersion()
    {
        /** @var Mage_Core_Model_Config_Element $moduleConfig */
        $moduleConfig = $this->getConfig()->getModuleConfig($this->getModuleName());
        return (string)$moduleConfig->version;
    }
public function getModuleVersion()
    {
        /** @var Mage_Core_Model_Config_Element $moduleConfig */
        $moduleConfig = $this->getConfig()->getModuleConfig($this->getModuleName());
        return (string)$moduleConfig->version;
    }
Returns module version number

@return string