MS 5910 LOOP problem 

If the loop resistance is less than 10ohm, the meter may indicate zero. The loop resistance can never be about 10ohm. The common value of loop resistance is 0.5 ohm maximum 2 ohms, 10 ohm value is nonsense. Such measurement has no meaning. It is similar to measuring 2 drops of water with a 10-liter bucket. This meter cannot measure loop rezistance! Other meters sold under the next brand "PEAKMETER" (MS5910) on aliexpress do not have this restrictions.