These instruments consist of a bimetallic maximum demand indicator combined with a moving iron system. The bimetallic meter movement with its drag indicator shows the maximum value, the moving iron meter the present value. They are working smoothly at temperatures between -10°C and +55°C because of their robust assembling. The instrument has a sealable resetting knob with which the red drag indicator can be resetted on the position of the meter movement’s pointer. (Do not turn lower!).