Protective Devices such as relays, overload coils, circuit breakers must be checked regularly to ensure that, they are always ready to operate correctly. If a fault occurs in the equipment, which they are protecting, routine relay testing quickly detects the faulty or incorrectly adjusted protection circuit and possibly prevent serious damage to plant or injury to personnel. As well as checking of the protective circuits correctly, it is usually necessary to measure its operating time. The microprocessor based time interval meter is used for this purpose in all relay test sets supplied by Ajit Electronics. These all are Built-in microprocessor based with multi range time interval meter. Timer automatically puts OFF the output, when timer reaches to its maximum value of the selected range. This Portable, suit-case model ensures safety of the instrument as well as the item under test.