I've owned both styles, the one in the original post and the other with the 2x20 LCD display. Neither were very accurate for transistor gain, or leakage values, nor diode forward voltage, nor Idss or cutoff voltage for JFETs. Resistance and capacitance measured well but not as good as a quality DMM. In the end I just bought a Peak analyzer.
They were good for giving the pinouts of transistors.