The Extech 380366 autoranges measurements up to 4000MOhm with IKMOhm resolution, while acting as a datalogger 380366: Insulation Tester+Datalogger Autoranging insulation measurements to 4000MOhm Features: 250/500/1000V Test Voltages Stores up to 16,000 readings with single store or a programmable rate of 1 to 65,000 seconds per sample Large dual 4000 count backlit LCD and fast 50 segment analog display Data Hold, Test Lock, Audible continuity, and Low Resistance functions Measure up to 600V AC RS-232 PC interface with Windows® 95/98/NT/2000/ME/XP compatible software Specifications: General specifications Display Backlit 3-3/4 digit (4000 count) LCD with analog indicator Sampling rate 2.5 samples/sec. (digital) 10 samples/sec. (analog) Audible Continuity Low resistance range with audible continuity < 4 Ω Over range indicator "OL" displayed when measurement exceeds range limits Low battery indicator " - +" symbol displayed when battery voltage is low Datalogger memory 16000 readings Datalogger Sample Rate Programmable - 1 to 65400 sec/sample or single manual record Power source Eight 1.5V AA cells Power consumption 20 to 90mA depending upon function (40 hours typical) Environmental CAT III Altitude 2000 meters for indoor use only Operating conditions 32 to 104°F (0 to 40°C) < 80% RH Storage conditions 14 to 140°F (-10 to 60°C) < 80% RH Dimensions/Weight 7.5 x 5.5 x 3" (190 x 140 x 77mm) / 2 lbs (900g) Environmental specifications Installation Category III 600V Pollution Degree Altitude up to 2000 meters Intended for indoor use only 380366 Extech Insulation Tester Megohmeter à¤Ã×èͧÇÑ´¤ÇÒÁà»ç¹©¹Ç¹