VERTEX ENGINEERS & ASSOCIATES

Hardness Scales	HWA, HRE, HRF, HRB, HV, HB
Measurement Range	HWA(0–20); HRE(23.5–110); HRF(26.2–105.5); HRB(0–85.3); HV(49–155); HB(35.2–153)
Resolution	0.1 HWA
Accuracy	±0.5 HWA
Repeatability	0.5 HWA
Thickness of measured material	0.6 mm – 8 mm
Inner diameter of the measured material	>10 mm
Display	128 * 64 dot matrix OLED
Power supply	Rechargeable lithium battery 3.7V @ 400mAh, full charge for over 5000 continuous measurements
Charging Port	USB (Type-C)
Size	203 * 97 * 30 mm
Weight	484 g
Supply Voltage	DC 5V
Working Temperature Range	-10~50℃, 0~85%RH (no condensation)
Storage Temperature Range	-10~60℃, 0~85%RH (no condensation)

Digital display	The top of the instrument is equipped with an OLED screen, which is easy to read and avoids errors caused by observing the dial with the naked eyes.
Data auto-locking function	The instrument is equipped with an automatic data-locking function, no need to press the handle all the way down when taking a reading.
Providing a variety of hardness scales	The instrument built-in six kinds of hardness scales, which can be converted between Webster (HWA), Rockwell (HRE), Rockwell (HRF), Rockwell (HRB), Vickers (HV), and Brinell (HB), no more tedious manual check table.
9 sets of data can be stored	Built-in memory chip, the instrument can store 9 groups of measurement results, meeting user's needs for multiple measurements of the measured object.
High resolution of 0.1 HWA	The instrument adopts eddy current induction principle measurement technology, its resolution is as high as 0.1HWA, making measurement more accurate.

Digital Webster Hardness Tester HW-20D