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Small OK and M-57 ohmmeters have been produced since the beginning of 1936 and 1941. Small-sized Ohmmeter Pocket '' OK '' was produced since 1936. The upgraded ohmmeter '' M-57 '' has been produced since 1941. Ohmmeter "OK" was decorated under the tree, and this is not glued film and factory production. Ohmmeter '' M-57 '' was released for a long time as probably none of the devices, its release was completed only in the late 70s. On the author's site of Vitaly Brusnikin, such an ohmmeter is dated 1975. An ohmmeter can measure resistances ranging from 20 ohms to 2 kilo ohms with an accuracy of "“10%. The total measurement limit of the ohmmeter is somewhat wider, from 0 to 5 Kilomas, but beyond these limits, the accuracy of the readings decreases to -20%. The ohmmeter is powered by one battery for a flashlight type KBS-L-0.5, and it is enough for more than one year of work. The zero setting in the ohmmeter is located at the front and the back of the magneto-electric system lock stands