Mercedes Benz 722.6 Transmission Fluid Dipstick Tool The tool is designed to measure the oil level of transmission. Full length:1220m Mercedes Transmission Dipstick Benz reference number 140-589-1521-00. For determining fluid level newer Mercedes with electronic transmission 722.6. The graduations on the fluid end (plastic dipping end) are: (Range) 25 (low) to 80 (high) The picture is not to scale.