Igaging® digital snap thickness gauge w/ spring load movement features ul style 'margin-top 0px; padding-top 5px; padding-bottom 5px;' range 0 - 1 1/16" / 27 mm resolution 0.0005"/0.01 mm/ 1/64" accuracy 0.0015" spring load movement with a push button battery cr2032 (1) interchangeable ball & flat contacts included; thread size #4-48 designed by igaging in california