Multi-functional portable balance for determining maturity of watermelon

[0015] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. As a part of this specification, the principles of the present invention are explained through embodiments.

[0016] A watermelon maturity measuring scale based on density measurement includes a measuring unit, a central calculation control unit and a display unit. The device is a tool that people carry in their daily lives, and can conveniently measure the ripeness of watermelon when it is necessary to judge the ripeness of the watermelon. The appearance of the device is like a spring scale, with a handle on the upper end and a scale body in the middle. The scale body contains a weight sensor, a length sensor and a fixed cord buckle for the measuring line. There are two measuring lines on the lower section. When measuring, first use a measuring line to make a circle along the length of the watermelon and fix it, and then use another measuring line to make a circle arou