Milton S-1253 Hand Held Compression Tester Range of 0 to 300 pounds per square inch or 0 to 2100 kilopascal Perfect for spark plug holes Great tool for checking cylinder head compression Not for use with a standard valve core Made in USA Milton is your number 1 source for Quality Air Accessories Since 1943 Milton has been producing Quality Air Accessories Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets