Jonard GPP-36 Polystyrene Push Pull Precision Force Gauge, 0-36oz, 0-1020 Graduation, +/- 1 Accuracy Measures tensile (pull) or compression (push) forces Analog gauge shows measurements in ounces (oz.) or grams (g) Measures present force with a measurement accuracy of + or - 1 graduation Made from polystyrene, which resists wear Measures 14 x 1 x 1-1/2 inches (H x W x D)