The UMA 0204 and UMB 0207 MELF resistors with advanced thin film technology offer an excellent resistive drift as low as 0.05% after 1000 hours of operation at full rated power. This is also known as endurance at 70°C test as described in the product datasheet. The chart and table illustrate the UMA 0204 and UMB 0207 Ultra Precision MELF resistors specified resistive drift over time compared to a MM Professional MELF resistor.