Updated:2025-03-13
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Getting Started Guide
User's Manual
Immediate display of water content
Reads ML3, SM150T, PR2 (analogue and SDI-12) or WET Sensor
Stores up to 1500 time-stamped readings
The HH2 Moisture Meter is a versatile readout unit for use with Delta-T soil moisture sensors. It can be used with the PR2 Profile Probe (both analogue and SDI-12* versions), ML3 ThetaProbe, SM150T and WET Sensors.
The HH2 readout unit offers impressive functionality in a compact, hand-held unit, designed for field use. Readings are displayed on the LCD and can be stored to memory for later download to a PC.
The unit can be operated with one hand, for convenience in the field. Each time-stamped reading includes a unique sample number, a plot identification number (A to Z), and a sensor location number (1 to 255).
The HH2Read Windows PC software provides a data import wizard for direct download into Excel or other PC spreadsheet packages, or into irrigation scheduling programs. Alternatively, data can be downloaded in comma-separated ASCII data file (.CSV) format.
Data is transferred to a PC using the RS-232 cable provided with each unit. Please note that most PCs no longer have an RS232 port; for USB connection a USB to RS232 adapter cable is required (see Accessories).


| Input connections | 1 water content sensor or 1 WET Sensor |
| Control outputs | – |
| Readings stored | 1,500 |
| Recording rate | – |
| Configuration | By keypad |
| Communication options | RS232 / USB [1] |
| Sensor excitation | 1 switched battery |
| Power | 9 V 6LR61 (PP3)alkaline |
| Battery life (dependent on usage) | ~ 5,000 readings |
| Enclosure rating | IP54 |
| Temperature range | 0 to +40°C |
| Display | 2 line x 16 character |
| Size | 125 x 80 x 45mm |
| Typical applications | Instantaneous reading of soil moisture / profiles/ WET Sensor |
| Sensor compatibility (maximum number of sensors that could be connected [2] | |
| ML3 | ✓ without temp |
| SM150T | ✓ without temp |
| PR2 | ✓ |
| PR2 SDI-12 | – |
| WET Sensor | ✓) |
| EQ3 | ✓(mV only) |
| Temperature | – |
| Tensiometers | – |
| Counters or Events | – |
| Relay Output | – |
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