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Gauge rod. - When properly seated in position, a rod shall not touch the bottom of the tank unless this is required by the design of the supporting elements. The rod shall be graduated throughout at intervals corresponding to the gallonage range within which the readings of liquid level to be made. Farm holding tanks shall be so constructed that nothing shall prevent vertical insertion of the gauge rod. That part of the gauge rod designed to hold the gauge rod in the gauge rod bracket and which comes in contact with the gauge and bracket, shall be sufficiently hardened that, under continual usage or careless handling, it will not become so worn that it will permit the gauge rod to hang to an improper depth in the tank, thereby causing an error in the measuring of the milk in the tank.
Surface gauge. - When properly engaged with its bracket and set to its lowest position, the surface gauge shall not touch the bottom of the tank. The gauge shall be graduated throughout at intervals corresponding to the gallonage range within which the readings of liquid level are to be made.