Firmware Version Upgrade for LR8400-23 (For LR8400-92 LR8400-93 PV Power Verifier Set) V9.15 Sep 27, 2016 Freeware USB Driver (BT3554 series) V1.00 Jul 29, 2016 Freeware USB Driver & Communication Command Instruction Manual for RESISTANCE METER RM3544 / RM3545 REV 4 Jul 08, 2016 Freeware Precision DC Voltmeter Application Disk (DM7275Series DM7276Series) Dec 17, 2015 Firmware MEMORY HiLOGGER LR8431-20 V1.11 Aug 24, 2015 Firmware POWER METER PW3336s/PW3337s V1.23 Dec 28, 2021 Freeware DMM Communicator for DT4200s (DT4900-01) Version 2.11 Jul 09, 2021 Freeware MEMORY HiCORDER Model 8860-50 / 8861-50 LabVIEW 2014 driver Mar 27, 2015 Software PQA-HiVIEW PRO 9624-50 V2.06 Mar 18, 2015 Freeware LabVIEW driver for the PW3335 Power Meter V1.00 Mar 11, 2015