With regard to measuring spindles as on the right side of the picture, the online trade (everywhere where such a spindle can still be found) thinks it is for measuring the frost protection in the cooling circuit. Just one copy I have ready and recently (last 2 days) used it for testing the frost protection in a car where G48 / BMW LC87 is used. Measurement shows protection from frost lower than 40 degrees – below scale. That is what raises questions. In November BMW-Werkstatt in the cooling system has the Frostschu The final 3 refills were made with Glysantin G48. Something is not right with measurement, only.. what could it be? Fear of using the car now, the concentration should be really so high. Fzg-total history does not include a renewal of the cooling fluids. tz measured to level 35 degrees. Just before the workshop appointment the liquid had to be refilled, Dest.-water was used, up to 250 mL. After the workshop appointment it needed to refill again, a total of 2 to 3 times. All that is known in this respect to the owner, at the same time user, are the above mentioned refills. Incidentally, measuring the frost protection with the other spindle on the enclosed image has brought about approximately the same results.