Haglöf's FACTOR GAUGE made from transparent plastic and with bevelled edges for optimal spotting and accuracy. Practical grip for index finger and thumb improves the results and simplifies the measuring operation. 60 cm/24” beaded chain. Four (4) different factors for the relascopic function: 0,5; 1, 2 and 4m2/ha or 5, 10, 20 and 40 f2/acre (English). Two factor columns per side.