4 selectable test parameters: Ra, Rz, Rt, Rq;
Three selectable sample lengths: 0.25, 0.8, 0.2, 0.50;
Two charging modes: standard charger and USD port, supporting operation while charging;
Calibration function, easy operation, high accuracy;
Optimized circuit design with transducer structure – high integrated power, driver, and display;
Data processing and calculation via high-speed DSP CPU, faster and more accurate;
Safety gate installed in the transducer ensures transducer safety and guarantees test accuracy;
Dot-matrix LED screen, high brightness, wide field of view, wide temperature range, suitable for various conditions;
Automatic shutdown, low power consumption design, long operating time.
Model DRT P4 Test parameters Ra, Rz, Rt, Rq.

Test range (µm): Ra, Rq: 0.05-10.0; Rz, Rt: 0.1-50
Sample length (mm): 0.25, 0.80, 2.50
Evaluation length (mm): 1.25, 4.0
Stroke length (mm): 6
Error ±15%
Indication resolution: 0.01
Contact tip radius & transducer angle: Tip radius: 10µm ± 1µm; Angle: 90° + 5°/-10°
Contact pin static force and rate of change:
Contact pin static force: ≤ 0.016N;
Rate of change: ≤ 800N/m.

Sensor guide head pressure ≤ 0.5N
Battery type: 3.7V lithium Lon battery
Dimensions: 32x16x10 cm (L x W x H)
Packaging weight: 1.5KG
Operating conditions: Temperature: -20 °C to 40 °C; Relative humidity: ≤ 90%, no ambient vibration or medium.