Insulation resistance measurements of up to 400 M_ at voltages of 250V, 500V or 1,000V can be performed by the Model 380353 High Voltage Megohmmeter. An analog display allows users to observe changes in a measurement. The instrument measures AC voltages up to 600V, and makes continuity measurements to 50?. Typical accuracy is ±5% of the reading. Fuse protection and an automatic discharge circuit are standard. The instrument comes with test leads, 8 AA batteries, spare fuse, shoulder strap and a hard carrying case. Price: $179. EXTECH INSTRUMENTS INC., Waltham, MA. (781) 890-7440.