| Feature | 566 | 568 | ST60 | ST80 | ST61/60+ | ST81/80+ |
| IR Temperature Range | -40 °C to 650 °C (-40 °F to 1202 °F) | -40 °C to 800 °C (-40 °F to 1472 °F) | -32 °C to 600 °C (-25°F to 1100 °F) | -32 °C to 760 °C (-25 °F to 1400 °F) | -32 °C to 600 °C (-25°F to 1100 °F) | -32 °C to 760 °C (-25 °F to 1400 °F) |
| Accuracy | <0 °C: ±(1 °C + 0.1 °/1 °C); ≥0 °C: ±1 % of reading or ±1 °C, whichever is greater <32°F: ±(2 °F +0.1 °/1 °F); ≥32 °F: ±1 % of reading or ±2 °F, whichever is greater | -32°C to -26°C: ±3 °C(±5 °F) -26°C to -18°C: ±2.5°C(±4 °F) -18°C to 23°C: ±2 °C(±3 °F) Above 23°C: ±1 % of reading or ±1 °C(±2 °F), whichever is greater; | <0 °C: ±(1 °C + 0.1 °/1 °C); ≥0 °C: ±1 % of reading or ±1 °C, whichever is greater <32°F: ±(2 °F +0.1 °/1 °F); ≥32 °F: ±1 % of reading or ±2 °F, whichever is greater |
| Repeatability | ±0.5 % of reading or ±0.5 °C (1 °F), whichever is greater | ±0.5 % of reading or ±1 °C (2 °F), whichever is greater | ±0.5 % of reading or ±1 °C (2 °F), whichever is greater (TEAM TO REDUCE) |
| Display Resolution | 0.1 °C / 0.1 °F | 0.1 °C / 0.1 °F | 0.1 °C / 0.1 °F |
| Spectral Response | 8 to 14 μm | 8 to 14 μm | 8 to 14 μm |
| Response Time (95 %) | <500 ms | <500 ms | <500 ms |
| Distance:Spot (90 % energy) | 30:1 | 50:1 | 30:1 | 50:1 | 30:1 | 50:1 |
| Laser sighting | Single laser, output <1 mW Class II, wavelength 630 to 670 nm | Single laser | Single laser, output <1 mW Class II, wavelength 630 to 670 nm |
| Emissivity | Digitally adjustable from 0.10 to 1.00 by 0.01 or via built-in table of common materials | Digitally adjustable from 0.10 to 1.00by 0.01 | Digitally adjustable from 0.10 to 1.00 by 0.01 or via built-in table of common materials |
| Data storage | 20 points | 99 points | 12 points | 12 points | 20 points | 99 points |
| Communication | none | USB 2.0 | | | none | none |
| Relative Humidity | 10 % to 90 % RH non-condensing up to 30 °C (86 °F) | 10 % to 90 % RH non-condensing up to 30 °C (86 °F) | 10 % to 90 % RH non-condensing up to 30 °C (86 °F) |
| Operating Temperature | 0 °C to 50 °C (32 °F to 122 °F) | 0 °C to 50 °C (32 °F to 122 °F) | 0 °C to 50 °C (32 °F to 122 °F) |
| Storage Temperature | -20 °C to 60 °C (-4 °F to 140°F) | -20 °C to 60 °C (-4 °F to 140°F) | -20 °C to 60 °C (-4 °F to 140°F) |
| Power | 2 AA /LR6 Batteries (alkaline or NiCD) | 2 AA /LR6 Batteries or USB connection when used with a PC | 9V Batteries (alkaline or NiCD) | 2 AA /LR6 Batteries (alkaline or NiCD) | 2 AA /LR6 Batteries or USB connection when used with a PC |
| Battery Life | 12 hours with laser and backlight on; 100 hours with laser and backlight off, at 100 % duty cycle (thermometer continuously on) | 20 hours with laser and backlight on; 40 hours with laser and backlight off | 12 hours with laser and backlight on; 100 hours with laser and backlight off, at 100 % duty cycle (thermometer continuously on) |