Introduction：

Soil compactness is also called soil hardness or soil firmness or soil penet-ration resistance. It is generally expressed as the resistance (in Pa) of a metal plunger or probe when it is pressed into the soil. Soil firmness is the ability of the soil to resist compaction and breakage by external forces and is one of the aspects of soil properties. In addition, soil physical properties include soil texture, structure, porosity, etc. It involves the firmness, plasticity, permeability, drainage, water storage capacity, and ease of root penet-ration.

Soil firmness consists of soil shear force, compression force and friction force. It is a synthetic indicator of the strength of the soil. When a metal plunger or probe is pressed into the soil, it is divided into two methods: dynamic load and static load, and the measured values differ from method to method, but there is a connection. The shape of the plunger has a cone, flat head, round ball and wedge, etc. These also have an effect on the measured value. The measured values for the same method are mainly determined by the soil texture, weight capacity and water content. Of these, water content has the greatest influence.

Soil compaction predicts soil bearing capacity, tillage and resistance to root extension. Soil firmness is an important indicator of soil physical properties and is used to evaluate soil tillage. Firm soils can prevent water infiltration, reduce fertilizer utilization, affect plant root growth, and lead to crop yield reduction.

Specification:

Range:0~100kg/cm²,0~1000N/cm²,0~10000kPa

Probe Length: 30cm; Connection Rod Length: 20cm; Total Measuring Depth: 50cm

Accuracy: +/-0.2% full scale +/-1 digit

Measuring device: Kgf(gf)/lbf/N can be selected

Display: 5-digit LCD liquid crystal display - device - mode - overload LED liquid crystal display - comparison LED liquid crystal display (reversible)

Sampling speed: 1000 times/second

Display update: <10 times, >15 times

Overload capacity: 120% of the full range (LCD, LED flashing and buzzer sounding)

A/D transducer: 16-bit signal

Microprocessor: 8-bit high-performance microprocessor

Battery operating time: all charged can be used continuously for about 10 hours

Charging time: about 8 hours

Use temperature: 0～40℃

The use of humidity range: 20% ~ 80%RH relative humidity

Power supply: internal NIMI rechargeable battery, AC adapter

Output: USB, RS232C, analog output

Output parameters: analog (-2 to +2V), comparison signal (-NG, OK, +NG), open collector MAX 30V 10mA, ultra-negative Ho alarm output (OVL), open collector MAX 30V 10mA

Peak hold: pressure or tension

Compare function: settable high/low set point with code

Storage function: 999 measured values

Display flip-flop function: measured value and measurement units

Alarm: overload and +NG (off / on selectable)

Other functions

(1) automatic zeroing (1 second - 60 seconds setting)

(2) Damping mode (4 level settings)

(3) key sound can be turned off or on to choose

Automatic power off function: 1 minute - 60 minutes can be selected

External connection switch: display hold, clear zero, and peak/tracking selection

Measurement calibration: can be calibrated by themselves to suit the environment changes

Gravitational acceleration: can be adjusted for gravitational acceleration

Dimensions and weight

Main body: length 220.5×width 78×height 32.3mm, about 520g

Mainframe + back panel + handle: length 230.5×width 90×height 44.5mm, about 1150