These B/M thermometers came from a warehouse clearance, from some research I believe they are bimetal (b/m) thermometers for the chemical,petrochemical, oil and gas, energy and water/wastewater industries. As I understand it the temperature measurement is designed for harsh and agressive environments. Please see the pictures for more details.
This is a used set but a complete set. BMW N43 has been written in pen on the front of the box as pictured.
Information sicker inside states:
“Timing Tool Set to adjust and lock the timing belt or chain may not be used during putting any force on removing screws, gears and pulleys on camshafts. This can cause permanent damage to the timing tool and engine.”