| Model | A2109/LSR | A2109/LSR/002 |
| Display | Inverting LCD Vertical 5 digit display | Inverting LCD Vertical 5 digit display |
| Display Functions | 180 degree Inverting | 180 degree Inverting |
| On Target Indicator | Yes | Yes |
| Low Battery Indicator | Yes | Yes |
| Function Icons | Comprehensive selection of ranges shown in display | Comprehensive selection of ranges shown in display |
| Optical Range | 50mm 2000mm | 50mm 2000mm |
| Optical Angle | 80 degree to reflective marker | 80 degree to reflective marker |
| Light Source | Red Laser Class II 635nm WARNING LASER RADIATION, DO NOT STARE INTO BEAM, CLASS II LASER PRODUCT | Red Laser Class II 635nm WARNING LASER RADIATION, DO NOT STARE INTO BEAM, CLASS II LASER PRODUCT |
| Measurement Modes | Optical rpm and rps (Also Count and Time interval) | Optical rpm and rps (Also Count and Time interval) |
| Via contact adaptor rpm & rps, metres, yards, feet, per minute & per second | Via contact adaptor rpm & rps, metres, yards, feet, per minute & per second |
| Count total revolutions, metres, feet, yards | Count total revolutions, metres, feet, yards |
| Measure Time interval in seconds between pulses (Reciprocal rate) | Measure Time interval in seconds between pulses (Reciprocal rate) |
| Speed Capture feature Maximum, Minimum or Average rate | Speed Capture feature Maximum, Minimum or Average rate |
| Speed Range Optical | 3 99,999 rpm | 3 99,999 rpm |
| Speed Range Contact | Maximum 50,000 rpm for 10 seconds | Maximum 50,000 rpm for 10 Second |
| Linear Speeds | 0.30 1500.0 Metres (1 4,500 feet/minute) | 0.30 1500.0 Metres (1 4,500 feet/minute) |
| Revolution Range Features | Fully Auto-ranging up to 0.001 digit or 1 digit fixed, User selectable | Fully Auto-ranging up to 0.001 digit or 1 digit fixed, User selectable |
| Count Mode Revolution | 0.1 Metres (Or equivalent in all ranges) | 0.1 Metres (Or equivalent in all ranges) |
| Accuracy Speed Modes Only | 0.02% of reading 1 digit | 0.02% of reading 1 digit |
| Time Interval Mode | 0 99,999 seconds Auto-ranging only (Maximum 0.01 revolution) | 0 99,999 seconds Auto-ranging only (Maximum 0.01 revolution) |
| Time-base Standard | 0.8 seconds or time between pulses | 0.8 seconds or time between pulses |
| Time-base Fast Modes | 0.1 seconds auto-selection in Maximum or Minimum capture mode | 0.1 seconds auto-selection in Maximum or Minimum capture mode |
| Memory Features | Last reading held for 1 minute, Auto Switch Off
Program settings retained in memory after power down off | Last reading held for 1 minute, Auto Switch Off
Program settings retained in memory after power down off |
| Pulse Output Model | | Active pull down via 22K Ohm series resistor |
| Power Requirements & Battery Type | Batteries not included, Only use 4 x Industrial byDuracell, AAA 1.5v Professional Alkaline Battery | Batteries not included, Only use 4 x Industrial byDuracell, AAA 1.5v Professional Alkaline Battery |
| Operating Temperature | 0 / +40C | 0 / +40C |
| Storage Temperature | -10 / +50C | -10 / +50C |
| Unit Dimensions | 213 x 40 x 39mm | 213 x 40 x 39mm |
| Housing Material | High flow ABS Metalised | High flow ABS Metalised |
