I don't think it comes with a calibration certificate. So no reason to trust it as a calibration reference.I have heard of people buying this to calibrate and check their torque wrenches. Heard it is pretty accurate. And if you check and log all of your torque wrenches, you can watch for them getting out of calibration I guess...
https://www.amazon.com/dp/B0085WMOO...NTSOFSKRQ&ref_=list_c_wl_lv_ov_lig_dp_it&th=1