Editor’s note: Originally published December 2020. Reviewed and updated November 2026. Some models mentioned here may have been updated or discontinued since; check current availability and specifications before buying.
Medical disclaimer: This article is general information, not medical advice. Ask a doctor or pharmacist about your situation.
The iProven DMT-489 and DMT-316 are both 2-in-1 ear and forehead thermometers with backlit screens and fast readings. The newer DMT-316 has an updated measuring algorithm, a more compact shape and a backlight that changes color at fever level, for only slightly more money. Some people still prefer the older DMT-489’s more ergonomic grip.
Quick answer
- Both take a forehead reading in about 3 seconds and an ear reading in about 1 second.
- DMT-316: newer, more compact, updated algorithm described by iProven as more accurate, and a fever-indicating backlight.
- DMT-489: older model that some people find more comfortable to hold.
- Forehead mode gives a quick check; ear mode is the more accurate of the two. Ear thermometers are recommended for babies 6 months and older.
iProven DMT-489 vs DMT-316 at a glance
| Feature | DMT-489 | DMT-316 |
|---|---|---|
| Modes | Ear and forehead | Ear and forehead |
| Forehead reading | About 3 seconds | About 3 seconds |
| Ear reading | About 1 second | About 1 second |
| Backlit screen | Yes | Yes, changes color at fever level |
| Algorithm | Original | Updated (more accurate, per iProven) |
| Shape | Larger; some find it more ergonomic | More compact |
| Storage pouch | Yes | Yes |
| Price | Slightly lower | Slightly higher |
Why choose an ear and forehead thermometer?
Children often resist oral readings because they won’t keep their mouth closed and tongue down long enough, which makes an accurate reading hard. An ear and forehead thermometer can take a temperature quickly with less fuss, even while a child is sleeping.
Keep the age guidance in mind. According to the American Academy of Pediatrics, ear thermometers are for babies 6 months and older, and rectal readings are the most accurate and the best choice for infants under 3 months. A fever is generally 100.4°F (38°C) or higher. Call a doctor right away if a baby 2 months or younger has a rectal temperature of 100.4°F or higher. For step-by-step help, see how to take a temperature.
The two models
iProven DMT-489
The DMT-489 is designed for the whole family. Forehead mode gives a quick indication when you gently touch it to the forehead for about 3 seconds, which is useful for checking a sleeping child between ear readings. Ear mode takes a reading in about a second with one click.
Using it is simple: turn it on, wait for the self-test and pre-warm, position it, click and read. It has just two buttons, a backlit screen that’s easy to read at night, and a beep loud enough to hear even if your hearing isn’t perfect. iProven describes it as clinically calibrated for medical use, and it comes with a storage pouch.
Listed specifications
- Ear and forehead modes
- Ear reading in about 1 second; forehead in about 3 seconds
- Backlit display
- Two-button operation with audible beep
- Storage pouch included
Pros
- Ear and forehead modes for versatility
- Fast readings
- Simple two-button operation
- Some people find it more ergonomic than the DMT-316
Cons
- Older algorithm; iProven describes the DMT-316 as more accurate
- Bulkier than the newer model
iProven DMT-316
The DMT-316 keeps the same quick readings: about 3 seconds on the forehead and about 1 second in the ear. Use the forehead mode for a quick check between ear readings, and the ear mode when you want a more accurate reading quickly.
Its backlit screen is easy to read in the dark, and the backlight color changes when the reading is at a fever level. iProven says the updated algorithm improves accuracy, and the redesigned shape is more compact and easier to use. It also comes with a pouch for clean storage.
Listed specifications
- Ear and forehead modes
- Ear reading in about 1 second; forehead in about 3 seconds
- Backlit display with fever color indicator
- Updated measurement algorithm
- Compact design; storage pouch included
Pros
- Updated algorithm for improved accuracy, according to iProven
- Ear or forehead readings
- More compact design
- Fever-level backlight color
- Fast readings with minimal disturbance
Cons
- Slightly more expensive than the DMT-489
- Some people find the older model more ergonomic
Which should you choose?
- Choose the DMT-316 for most families. For a small price difference you get the updated algorithm, a more compact shape and a fever-color backlight.
- Choose the DMT-489 if you find its larger shape more comfortable to hold, or it’s easier to find at a good price.
For more options, see our best medical infrared thermometers or the Braun ThermoScan 5 vs 7 comparison.
Bottom line
Both iProven models offer quick ear and forehead readings and an easy-to-read backlit display. Based on the manufacturer’s information, the newer DMT-316 is the better pick for most people. If your child is very young or unwell, follow your doctor’s advice on which method to use.
