Abstract: A device for checking involutes and helix angles of cylindrical gears by electronically compensating for mechanical errors, which includes a mechanically operating transmission chain, especially a rolling transmission, a sine bar, a sliding block linkage and/or a lever transmission, which transmission chain guides a measuring feeler relative to a gear to be checked on the required reference curve. The device furthermore includes one length pick-up each at both ends of the transmission chain for measuring their respective motions, a computer unit for multiplying the signal of one of the length pick-ups with the put-in rated transmission ratio of the transmission chain and for subtracting the multiplied signal from the signal of the other length pick-up, and also includes a device for subtracting with the proper prefix + or - the thus formed difference signal as correction value from the measured value of the measuring feeler.