UMH-J2 Digital Colony Counter
The UMH-J2 is a compact digital colony counter designed for manual counting of bacterial and microbial colonies on culture plates. It accommodates Petri dishes from 50 to 90 mm and combines white LED illumination, magnified observation, a counting pen and a 3-digit digital display in one benchtop laboratory unit.
During counting, the illuminated counting area and adjustable magnification help the operator distinguish colonies more clearly. The counting pen is used to mark or register individual colonies while the counter records the accumulated count, with audible feedback helping reduce missed or repeated counts.
Key Features
0–999 Digital Colony Counting
The 3-digit LED display provides an accumulated counting range from 0 to 999 for routine microbiology plate counting.
Adjustable White LED Illumination
A white LED array illuminates the culture plate to improve visibility of bacterial colonies during manual counting.
3–9× Magnified Observation
The magnifying system supports 3–9× observation to help identify small or closely positioned colonies more clearly.
50–90 mm Petri Dish Compatibility
The UMH-J2 is designed for Petri dishes with diameters from 50 to 90 mm, covering common laboratory culture plate sizes.
Counting Pen with Audible Feedback
The counting pen supports individual colony registration while an audible signal provides immediate feedback during counting.
Wide-Range Power Input
AC 100–240 V, 50/60 Hz input allows the unit to be used in laboratories with different local electrical standards.
How the Colony Counter Works
The UMH-J2 is a manual digital colony counting system. A Petri dish containing the cultured sample is placed on the illuminated counting platform. White LED light enhances the contrast between colonies and the culture medium, while the magnifier provides an enlarged view of the counting area.
The operator visually identifies individual colonies and uses the counting pen to register them sequentially. Each registered colony increases the displayed total, while audible feedback confirms the counting action.
This manual marking-and-counting workflow helps the operator keep track of colonies that have already been counted and reduces the likelihood of omissions or repeated counting.
LED Illumination and Magnification
Colony visibility can vary depending on colony size, culture medium and plate conditions. The UMH-J2 combines LED illumination and magnified observation to make manual inspection easier.
| Lighting | White LED Array |
|---|---|
| Magnification | 3–9× |
| Digital Display | 3-Digit LED Display |
| Counting Range | 0–999 |
Compact Manual Counting Workflow
The compact benchtop design occupies limited laboratory space and is suitable for routine colony-counting work where operators prefer direct visual confirmation of individual colonies.
- Place the cultured Petri dish on the illuminated counting area.
- Adjust the illumination and viewing position as required.
- Use magnification to inspect small or closely spaced colonies.
- Register colonies individually with the counting pen.
- Monitor the accumulated count on the digital display.
- Use the audible response as confirmation of each counting action.
Typical Applications
The UMH-J2 colony counter is suitable for routine manual colony counting in microbiology laboratories and other facilities that evaluate microbial growth on culture plates.
- Bacterial colony counting on agar plates.
- Routine microbiology laboratory work.
- Microbial culture evaluation.
- Food and beverage microbiology laboratories.
- Pharmaceutical and quality-control laboratories.
- Water and environmental microbiology testing.
- Research and teaching laboratories.
Technical Specifications
| Model | UMH-J2 |
|---|---|
| Product Type | Digital Manual Colony Counter |
| Lighting | White LED Array |
| Digital Display | 3-Digit LED Display |
| Counting Range | 0–999 |
| Compatible Petri Dish | Ø50–90 mm |
| Magnification | 3–9× |
| Input Voltage | AC 100–240 V |
| Frequency | 50/60 Hz |
| Input Power | 20 W |
| Protection Class | IP21 |
| Permissible Relative Humidity | Up to 80% |
| Permissible Ambient Temperature | 5–50°C |
| Dimensions | 255 × 210 × 160 mm |
| Net Weight | 2.2 kg |
UMH-J2 vs. UMH-J3
The UMH-J2 is the more compact model in the series and is intended for Petri dishes up to 90 mm. The larger UMH-J3 supports larger culture plates and higher power.
| Specification | UMH-J2 | UMH-J3 |
|---|---|---|
| Counting Range | 0–999 | 0–999 / 0–9999 |
| Compatible Petri Dish | Ø50–90 mm | Ø50–150 mm |
| Input Power | 20 W | 40 W |
| Magnification | 3–9× | 3–9× |
| Dimensions | 255 × 210 × 160 mm | 360 × 300 × 180 mm |
| Net Weight | 2.2 kg | 4.0 kg |
Product Configuration Notes
The UMH-J2 is a manual digital colony counter rather than an automatic image-analysis colony counter. Colony identification remains under direct operator control, while illumination, magnification, counting registration and digital display assist the manual counting process.
If automatic colony recognition, camera-based imaging or software analysis is required, please specify this when requesting a quotation so a different colony-counting configuration can be recommended.
Before Ordering
Please provide the following information so UMY Medical can confirm the appropriate colony counter configuration.
- Required quantity.
- Destination country.
- Typical Petri dish diameter.
- Expected colony-counting range.
- Manual or automatic colony counting requirement.
- Local voltage and frequency.
- Required laboratory, tender or documentation requirements.
Frequently Asked Questions
What Petri dish sizes can the UMH-J2 colony counter accommodate?
The UMH-J2 is specified for Petri dishes from 50 to 90 mm in diameter.
What is the counting range?
The 3-digit display provides a counting range from 0 to 999.
Does the colony counter provide magnification?
Yes. The specified magnification range is 3–9× to assist visual inspection of colonies.
How are colonies counted?
The UMH-J2 uses a manual counting workflow in which the operator visually identifies colonies and registers them using the counting pen while the digital display records the accumulated count.
Does the UMH-J2 automatically recognize colonies?
No. The UMH-J2 is a manual digital colony counter. Automatic camera-based colony recognition requires a different automatic colony-counting system.
What is the difference between the UMH-J2 and UMH-J3?
The UMH-J2 supports Petri dishes up to 90 mm and uses 20 W power, while the larger UMH-J3 supports dishes up to 150 mm and is rated at 40 W.
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