The table below compares some of the different types of base metals that are used in the construction of RTD elements.

Element Material	Temperature Range	Benefits	∝ (%/°C)
Platinum Thin-film	-200°C to 800°C	Best range Best stability Good linearity	0.375 to 0.385
Nickel Thin-film	-100°C to 260°C	Lost cost Best sensitivity	0.618
Balco	-100°C to 204°C	Low cost High sensitivity	0.518 to 0.527
Note: ∝ is normally used to distinguish between RvT curves of the same element or those of different material.

Temperature (°C) Class A Limit Class B Limit -200 ±0.55°C ±1.3°C -100 ±0.35°C ±0.8°C 0 ±0.15°C ±0.3°C 100 ±0.35°C ±0.8°C 200 ±0.55°C ±1.3°C 300 ±0.75°C ±1.8°C 400 ±0.95°C ±2.3°C 500 ±1.15°C ±2.8°C 600 ±1.35°C ±3.3°C 350 ±1.45°C ±3.6°C		Class ± Temperature Accuracy in °C t < 0°C t > 0°C 1/2 DIN 0.2 + 0.014 [T] 0.2 + 0.0035 [T] DIN 43760 0.4 + 0.028 [T] 0.4 + 0.007 [T] 2 x DIN 0.8 + 0.028 [T] 0.8 + 0.007 [T]