Create a paper record while checking temperature with the Anritsu AP-400 and AP-450. The integrated thermal printer allows operators to attach readings to inspection sheets, production records or test reports without using a separate printer.
Choose the instrument and probe together. Connector type, thermocouple type and the probe's operating limits determine which combination suits your measurement.

Printing options for different tasks
- Manual printing: Press PRINT to capture a reading with time information.
- Interval printing: Select one of eight intervals for repeated measurements.
- Numbered printing: Produce sequentially numbered readings for inspection points or samples.
- Memory printing: Store up to 100 readings and print them together later.
AP-400 and AP-450 comparison
| Selection point | AP-400 | AP-450 |
| Probe connector |
ASP |
ANP miniature connector |
| Thermocouple versions |
Type E or K |
Type E, K, J, T or R |
| Input channels |
1 |
1 |
| Thermocouple selection |
Fixed when ordered |
Fixed when ordered |
Thermocouple types are not switchable. Confirm the instrument suffix and probe connection before ordering.
Temperature ranges and resolution
| Thermocouple | Instrument range at 1°C resolution | Range at 0.1°C resolution |
| E |
-200 to 800°C |
-104.9 to 504.9°C |
| K |
-200 to 1370°C |
-104.9 to 504.9°C |
| J |
-200 to 1100°C |
-104.9 to 504.9°C |
| T |
-200 to 400°C |
-104.9 to 400.0°C |
| R |
0 to 1760°C |
Not available |
The display changes automatically to 1°C resolution outside the 0.1°C range. Always remain within the connected probe's temperature rating.
Instrument measurement accuracy
| Input | Resolution | Temperature | Accuracy |
| E, K, J, T |
0.1°C |
0°C and above |
±(0.05% of reading + 0.2°C) |
| E, K, J, T |
0.1°C |
Below 0°C |
±0.5°C |
| E, K, J, T |
1°C |
0°C and above |
±(0.1% of reading + 1°C) |
| E, K, J, T |
1°C |
Below 0°C |
±(0.5% of reading magnitude + 1°C) |
| R |
1°C |
0 to 1760°C |
±(0.1% of reading + 3°C) |
Probe error and reference junction compensation must also be considered when evaluating total measurement accuracy.
Printing interval and battery life
| Printing interval | Sampling rate | Approximate battery life |
| No printing |
Twice per second |
110 hours |
| 3 seconds |
Twice per second |
15 hours |
| 10 seconds |
Every 5 seconds |
60 hours |
| 30 seconds |
Every 5 seconds |
90 hours |
| 1 minute |
Every 10 seconds |
120 hours |
| 5 minutes |
Every minute |
8 days |
| 10 minutes |
Every minute |
9 days |
| 30 minutes |
Every minute |
10 days |
| 60 minutes |
Every minute |
10 days |
Battery life varies with operating conditions and printing frequency.
General specifications
| Display |
LCD |
| Printing system |
Thermal line dot; 37 mm paper width; approximately 1,000 lines per roll |
| Memory capacity |
100 readings |
| Power |
4 AA alkaline batteries; optional dedicated AC adaptor |
| Reference junction compensation accuracy |
±0.2°C at 25 ±10°C |
| Temperature coefficient |
±0.01% of measurement range per °C outside 25 ±10°C |
| Maximum signal source resistance |
500 Ω |
| Operating environment |
0 to 40°C; 0 to 80% RH, non-condensing |
| Storage environment |
-20 to 50°C; 0 to 85% RH, non-condensing |
| Dimensions |
Approximately 68 × 201 × 42 mm, excluding protrusions |
| Weight |
Approximately 350 g including batteries |
Probes, paper and accessories
Select a surface, insertion or air-temperature probe according to the measurement task. Confirm its thermocouple type, connector and temperature rating against the instrument configuration.
| Item | Ordering information |
| Replacement thermal paper |
ACAP4; pack of 5 rolls |
| 100 V AC adaptor |
AD-100-500-HR-R |
| 115 V AC adaptor |
AD-115-500-HR-R |
| 220 V AC adaptor |
AD-220-500-HR-R |
| Temperature probe |
Sold separately; specify the application and required connection |
Standard supplied items include a soft case, four AA alkaline batteries, paper jam fixer, printer paper, instruction manual and test report.
Replacing an AP-800 series thermometer
For replacement of an AP-800K, AP-800E, AP-850K or AP-850E, provide the existing instrument and probe model numbers. Confirm connector and thermocouple compatibility before reusing a probe with the AP-400 or AP-450.
Contact us for pricing and availability. Include the model, thermocouple type, probe requirements, quantity and any additional paper or power adaptor required.