product description: The automatic dog estrus ovulation tester consists of three parts: a measuring probe, a digital display for reading data, and a handle with a standard 9 volt battery. The switch is located on the back of the handle. There are two parallel (parallel) electrodes at the top of the probe for measuring the resistance of the vaginal mucus. The current generated by the two electrodes and the electric field generated by this trace current are harmless to animals and humans. The ovulation tester is made of polyethylene with good chemical stability and insulation. The entire instrument is water resistant so it can be cleaned to keep the instrument clean and maintain.