supply of digital magnetic and residual field indicator (gauss meter) to measure magnetic residual fiel d strength in tested object; portable and handy; measuring range 0.1 gauss to 199 gauss. the unit can be operated on both side ac & dc supply with chargeable battery, lcd display; resolution 0.1 gauss with cali bration certificate traceable to nabl. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation