This International Standard specifies the requirements for the equipment required to measure manually the liquid level or the corresponding volume of petroleum and petroleum products stored in tanks and containers.
BS ISO 4512:2001 history
2001BS ISO 4512:2001 Petroleum and liquid petroleum products. Equipment for measurement of liquid levels in storage tanks. Manual methods
1970BS ISO 4512:2000 Manual method of measuring liquid level in storage tanks for petroleum and liquid petroleum products