1. Introduction
The HABOTEST HT662 is a portable and precise brake fluid liquid oil tester designed to measure the water content in DOT3, DOT4, and DOT5.1 brake fluids. This device helps ensure vehicle safety by indicating when brake fluid needs to be replaced due to excessive moisture absorption. It features a high-definition backlit tricolor screen, high-sensitivity metal probe, rapid response, and dual alerts with sound and light.
Figure 1: HABOTEST HT662 Brake Fluid Liquid Oil Tester Analyzer Meter
2. Safety Information
Please read this instruction manual carefully before use and strictly observe the safety rules and the caution, attention, and warnings listed in this manual.
- Always wear appropriate personal protective equipment, such as gloves and eye protection, when handling brake fluid.
- Avoid contact of brake fluid with skin and eyes. In case of contact, rinse immediately with plenty of water and seek medical advice.
- Do not use the detector pen if the screen does not display or if it appears damaged.
- Keep the device away from children.
- Ensure the probe is clean and dry before and after each use to maintain accuracy.
- Do not immerse the entire device in liquid; only the probe should be submerged.
3. Product Overview
The HT662 brake fluid tester is designed for ease of use and portability. Familiarize yourself with its components:
Figure 2: HT662 Labeled Parts
- Battery Compartment Cover: Located at the top, secures the batteries.
- Pen Clip: For easy portability, allows attachment to pockets.
- Power Switch (Red button): Press to turn the device on or off.
- Function Switch (Green 'S' button): Press briefly to switch between DOT3, DOT4, and DOT5.1 brake fluid types.
- Display Screen: Shows water content percentage and selected DOT type, with tricolor backlighting.
- Probe: High-precision metal probe for immersion in brake fluid.
- Pen Cap: Protects the probe when not in use.
Figure 3: Key Features
4. Specifications
| Function | Range/Description |
|---|---|
| Display | LCD Display |
| Moisture Detection Range | 0% ~ 4% |
| Accuracy | ±0.3% |
| Alarm Mode | Sound and light alarm (Visible and audible) |
| Probe Shape | Oblate shape |
| Backlight | Red and green double color backlight (Tricolor: Green 0-2%, Yellow 2-3%, Red >3%) |
| Signal Intensity Indication Method | Sound from slow to fast; backlight from green to red; display data from low to high |
| Auto Power Off | No operation, no sensing signal will shut down automatically in about 5 minutes |
| Low-Battery Indication | Yes (Battery symbol on display) |
| Weight | Approx. 41g (0.039KG) |
| Size | 175 x 23 x 27mm (174 x 23 x 28mm) |
| Power | 2 x 1.5V AAA batteries (not included) |
| Safety Rating | EN61326-1 |
| DIY Supplies | Electrical |
| Certification | CE, FCC, RoHS |
Figure 4: Technical Parameters
Figure 5: Product Dimensions
5. Setup
5.1 Battery Installation
The HT662 requires two 1.5V AAA batteries (not included). To install:
- Unscrew the battery compartment cover at the top of the device (refer to Figure 2).
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover and screw it tightly to secure.
Figure 6: Battery Installation
6. Operating Instructions
6.1 Powering On/Off
- To power on: Press the red power switch button. The device will emit a beep and the display will light up.
- To power off: Press and hold the red power switch button until the display turns off. The device also features an automatic shutdown function after 5 minutes of no operation or sensing signal.
6.2 Selecting Brake Fluid Type
After startup, the device defaults to DOT3 brake fluid type. To switch between DOT3, DOT4, and DOT5.1:
- Briefly press the green 'S' (Function Switch) button. The display will cycle through DOT3, DOT4, and DOT5.1. Select the type corresponding to the brake fluid you are testing.
Figure 7: Brake Fluid Type Selection
6.3 Performing a Test
- Ensure the device is powered on and the correct brake fluid type is selected.
- Remove the protective pen cap from the probe.
- In a clean air environment, press the power key to turn on. The detector will start preheating for 3 seconds, and an analog bar will be displayed during this time.
- After waiting for about 3 seconds for preheating to complete, immerse the metal probe into the brake fluid reservoir. Ensure the probe is fully submerged in the liquid.
- The device will display the water content percentage.
Figure 8: Testing Brake Fluid
6.4 Interpreting Results (Tricolor Screen)
The HT662 features a high-definition backlit tricolor screen that automatically matches the suitable backlight color based on the measured water content, providing clear visual indication:
- Green Backlight (Values 0-2%): Indicates that the brake fluid is in good condition and safe to use.
- Yellow Backlight (Values 2-3%): Suggests that the brake fluid is starting to absorb moisture and should be monitored. Replacement may be necessary soon.
- Red Backlight (Values greater than 3%): Indicates that the brake fluid has absorbed too much moisture and needs immediate replacement to ensure braking performance and safety.
In addition to the visual cues, the device provides audible alerts. The signal intensity indication method involves the sound from slow to fast, and the backlight changing from green to red as the water content increases.
Figure 9: Tricolor Screen Interpretation
6.5 Low Voltage Warning
When the battery voltage is below 2.6V, a battery symbol will be displayed in the upper right corner of the screen. If the battery voltage drops to approximately 2.4V or below, the testing pen will automatically power off. Replace the batteries promptly when the low voltage warning appears.
6.6 Automatic Shutdown
If there is no operation within 5 minutes after startup, the instrument will automatically power off to conserve battery life.
Figure 10: Low Voltage Warning and Automatic Shutdown
Video 1: HABOTEST HT662 Product Demonstration
7. Maintenance
- Cleaning: After each use, clean the metal probe thoroughly with a dry, lint-free cloth to remove any brake fluid residue. Ensure the probe is completely dry before replacing the pen cap.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures. Always replace the protective pen cap to prevent scratches and oxidation of the metal detection head.
- Battery Replacement: Replace batteries promptly when the low voltage warning appears to ensure accurate readings and prevent device malfunction.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | Dead or incorrectly installed batteries | Check battery polarity and replace with new AAA batteries if necessary. |
| Inaccurate readings | Dirty probe, incorrect brake fluid type selected, or probe not fully submerged | Clean and dry the probe. Ensure the correct DOT type is selected. Submerge the probe completely in the fluid. |
| Low voltage warning appears frequently | Weak batteries | Replace both AAA batteries with new ones. |
| Automatic shutdown occurs too quickly | No operation or sensing signal for 5 minutes | This is a normal power-saving feature. Ensure you are actively using the device during testing. |
9. User Tips
- For best results, perform tests in a clean environment to avoid contamination of the brake fluid or the probe.
- Always ensure the probe is clean and dry before and after each test to prevent cross-contamination between different brake fluid types or inaccurate readings.
- When testing, immerse the probe into the brake fluid for a few seconds to allow for a stable reading.
- The pen clip design makes it convenient to carry the tester in a shirt pocket, ensuring it's always handy for quick checks.
10. Warranty and Support
HABOTEST products are manufactured to high-quality standards. For any technical assistance or warranty inquiries, please contact your retailer or the official HABOTEST support channels. Keep your purchase receipt as proof of purchase.
This product has passed various certifications including EAC, CE, RoHS, and CATIII, ensuring its quality and safety standards.
