; Fluke VR1710 Fluke VR1710 £14 /day. Minimum hire 7 days. The Fluke VR1710 voltage analyser monitors and records supply voltage and measures frequency and harmonics Details Hire now ; LEM Heme VlogQ LEM Heme VlogQ £8 /day. Minimum hire 7 days. The VlogQ voltage analyser is designed to detect and record power quality problems in a wide range of installations Details Hire now ; Chauvin Arnoux L261 Chauvin Arnoux L261 £8 /day. Minimum hire 7 days. The L261 logger is ideal for industrial, commercial or residential supervision, monitoring of voltage harmonics, long-term power supply monitoring, etc. Details Hire now