... Operating Environment: 20 to 90%RH, no dew formation HAKKO 498 Anti-static Wrist Strap Tester,system tester static measurementFeatures:Can ... . Eliminates product defects caused by static electricity.Specifications:Model No. 498 Power Supply: 9V Dry Battery Operating Environment: 0 to 40 ... 104°F), 20 to 90%RH no dew formation HAKKO 498 Anti-static Wrist Strap Tester,system tester static measurement