supply of portable handheld digital gauss meter , portable handheld digital gauss meter (tesla meter) to model no. d20b of m/s lab magnet or exactly equivalent, complete with probe, battery, carrying case, calibration certificate, warranty certificate, technical datasheet, and all standard accessories. specifications: 1) type : digital, 2) measurement : ac/dc magnetic field, 3) range : up to 20,000 gauss, 4) resolution : 0.1 gauss, 5) accuracy : +/- 1.0% or better, 6 ) display : digital lcd, 7) probe : suitable for magnetic surface measurement, 8) power source : battery op erated, 9) battery life : minimum 18 hours. note: the offer shall accompany the catalogue / brochure of the item. [ warranty period: 12 months after the date of delivery ] ]