... Sclerometer (Fruit hardness Tester), this series includes GY-1 GY-2 and GY-3 three models, used to judge fruits’ maturity ... colleges and universities, ect. Model difference:Fruit Sclerometer: GY-1 / GY-2 / GY-3Specification: Fruit Sclerometer (Fruit hardness Tester), this series ... includes GY-1 GY-2 and GY-3 three models, used to judge fruits’ maturity ...