AcuRite 681a
AcuRite Digital Instant Read Thermometer User Manual
Model: 681a
Introduction
This manual provides instructions for the proper use and care of your AcuRite Digital Instant Read Cooking Thermometer. This device is designed to provide accurate and quick temperature readings for various food items, ensuring they are cooked to a safe internal temperature. It features a durable stainless steel probe and an easy-to-read LCD display.
Product Overview

Image: The AcuRite Digital Instant Read Thermometer, showing its white body, black LCD display, and stainless steel probe.
The AcuRite Digital Instant Read Thermometer (Model 681a) is a compact and robust tool for precise temperature measurement. Key features include:
- Large, easy-to-read LCD display.
- 4.5-inch stainless steel probe for accurate readings.
- Instant response readings in both Fahrenheit (°F) and Celsius (°C).
- Temperature range: 32°F to 450°F (0°C to 232°C).
- Protective plastic pocket clip sheath with USDA recommended temperature guide.
- Built-in user calibration adjuster.
- NSF certified for public health and safety.
Setup
Battery Installation
The thermometer is powered by a battery. To install or replace the battery:
- Locate the battery compartment cover, typically on the back or side of the unit.
- Use a small screwdriver or coin to open the compartment.
- Insert the required battery type (refer to specifications for details) ensuring correct polarity (+/-).
- Replace the battery compartment cover securely.
Initial Power On
Press the power button (usually marked with a ⑂ symbol) to turn on the thermometer. The LCD display will illuminate and show the current temperature or a default reading.
Operating Instructions
Taking a Temperature Reading
To obtain an accurate temperature reading:
- Ensure the thermometer is clean and dry before use.
- Insert the stainless steel probe into the thickest part of the food item, avoiding bone or gristle.
- Wait for the display to stabilize. The instant-read feature provides a quick response.
- Read the temperature displayed on the LCD screen.
- Remove the probe from the food.

Image: The AcuRite thermometer probe inserted into a roasted chicken, displaying a temperature reading.
Switching Temperature Units (°F/°C)
The thermometer allows you to switch between Fahrenheit and Celsius units. Locate the ℉/℃ button on the device and press it to toggle between the two temperature scales.
Using the Protective Sheath and Temperature Guide
The thermometer comes with a protective plastic sheath that also functions as a pocket clip. Printed on the sheath is a convenient USDA recommended temperature guide for various types of meat, providing quick reference for safe cooking temperatures.

Image: The AcuRite thermometer alongside its protective sheath, which features a pocket clip and temperature guide.
Maintenance
Cleaning and Care
To ensure the longevity and accuracy of your thermometer:
- Wipe Clean: After each use, wipe the stainless steel probe with a damp cloth and mild detergent. Rinse thoroughly and dry completely.
- Do Not Immerse: Do not immerse the entire thermometer unit in water or place it in a dishwasher, as this can damage the electronic components.
- Storage: Store the thermometer in its protective sheath when not in use to prevent damage to the probe.
Calibration
The thermometer features a built-in user calibration adjuster. If you suspect the readings are inaccurate, consult the full product manual or manufacturer's website for detailed calibration instructions. Typically, calibration involves using an ice bath or boiling water to set a known reference point.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermometer will not turn on. | Dead or incorrectly installed battery. | Check battery installation. Replace battery if necessary. Ensure battery compartment is securely closed. |
| Inaccurate temperature readings. | Probe not inserted correctly; calibration needed; extreme ambient temperature. | Ensure probe is inserted into the thickest part of the food, avoiding bone. Perform user calibration if available. Use in recommended temperature environments. |
| Display shows "LO" or "HI". | Temperature is outside the thermometer's measurable range. | Ensure the temperature being measured is within the 32°F to 450°F (0°C to 232°C) range. |
Specifications
| Feature | Detail |
|---|---|
| Brand | AcuRite |
| Model Name | Digital Instant Read Cooking Thermometer |
| Item Model Number | 681a |
| Temperature Range | 32°F to 450°F (0°C to 232°C) |
| Resolution | 0.1°F |
| Probe Length | 4.5 Inches |
| Display Type | LCD |
| Power Source | Battery Powered |
| Outer Material | Stainless Steel |
| Color | Stainless Steel |
| Product Care Instructions | Wipe Clean |
| Certification | NSF Certified |
| Item Weight | 1.41 ounces |
| UPC | 072397006811, 072397681100 |
Warranty and Support
For warranty information, technical support, or to purchase replacement parts, please visit the official AcuRite website or contact their customer service department. Keep your purchase receipt as proof of purchase.
AcuRite Official Website: www.acurite.com