The UT505B is the wider-range model in the UT505 pair: a CAT IV 600 V insulation resistance tester and True-RMS digital multimeter in one handheld, reading insulation resistance up to 200 GΩ at test voltages from 50 V to 1000 V to IEC 61557.
Insulation testing covers 0.01 MΩ to 200 GΩ with Polarization Index and DAR diagnostics, stepped-voltage testing, and automatic discharge, and it adds an automatic fuse check that verifies the current-input fuse before a reading is taken. As a 6000-count multimeter it measures AC/DC voltage and resistance, capacitance from 100 pF to 500 µF, frequency, and low resistance from 0.01 Ω to 20 kΩ, with True-RMS sensing and storage for 99 groups.
It suits electrical maintenance, motor and cable testing, and troubleshooting on higher-resistance insulation.
| Test Voltages | 50 V / 100 V / 250 V / 500 V / 1000 V |
| Insulation Resistance | 0.01 MΩ to 200 GΩ |
| IR Accuracy | ±(1.5% + 5) |
| DC Voltage | 0 to 600 V, ±(2% + 3) |
| AC Voltage | 0 to 600 V, ±(1.5% + 5) |
| Frequency | 45 to 1 kHz, ±(0.1% + 3) |
| Capacitance | 100 pF to 500 µF, ±(5% + 5) |
| Low Resistance | 0.01 Ω to 20 kΩ, ±(1.5% + 3) |
| General Resistance | 0.01 kΩ to 10 MΩ, ±(3% + 3) |
| Display Count | 6000 |
| True RMS | Yes |
| PI / DAR | Yes |
| Step Voltage | Yes |
| Auto Discharge | Yes |
| Data Storage | 99 groups |
| Auto Fuse Check | Yes |
| Compliance Standard | IEC 61557 |
| Safety Rating | CAT IV 600 V |
| Power | 6 × 1.5 V (LR6) |
| Dimensions (W × H × D) | 103 × 225 × 59 mm |
| Weight | 630 g |
Manufacturer's Rep & National Distributor — Est. 2005
