... , oxygen, electrodes, tachometer, hygrometer,Massager,etc. KL-0071 Special design digital tachometer Descriptions:The handy key board for the selection of ... the product departments of motor,fan,paper-product,plastics,chemical fiber,washing-machine, automobile ,airplane,steame etc.*Max/Min Value*Memory ... ×1.5V AAA BATTERYDimensions72mm x 136mm x 33mmWeight146g Special design digital tachometer