Simple metering and weighing device

The utility model discloses a simple metering and weighing device which comprises a crane scale and a transparent plastic barrel, the transparent plastic barrel is hung at the bottom of the crane scale, a discharging pipeline is arranged on the transparent plastic barrel, and a valve is arranged on the discharging pipeline. According to the simple metering and weighing device, when a chemical reagent is dropwise added into the reaction kettle, the discharging pipeline is connected with the feeding hole of the reaction kettle, the valve is opened for dropwise adding, and the dropwise adding amount and the dropwise adding speed can be obtained by recording the readings of the lifting scale in unit time; and the dripping speed and weight can be known by observing the liquid level height change of the plastic barrel before and after dripping, so that the safety risk caused by liquid level meter blockage and sensor display failure in the traditional dripping metering process is overcome, and the dripping device is