This electronic mold strength tester ensures a practically movement-free force measurement by means of an oscillating crystal-controlled sensor. The measured force, which corresponds to the penetration resistance, indicates the strength rate. The tester comprises a digital display unit, a multifunction push-button switch and two 1,5 V batteries. It measures and stores the maximum value in N/cm2 or PSI, automatically calibrates the zero point, retains the value last measured in storage, and then turns off automatically.