Ohaus's Harvard Trip Mechanical Balance is great for young students just learning about weights and measures. Two roomy stainless steel platforms offer plenty of space for samples, and the built-in sliding scale lets you easily find the difference in mass between two objects. The counterbalance knob provides quick zeroing and stays in position over time. Steel construction stands up to years of heavy classroom use. Choose a single-beam balance, a double-beam balance or a double-beam balance with tare for more accurate measurements.