... , digital hygrothermograph, high voltage megohmmeter, ground resistance tester, electric leakage switch tester,gas detector.2. Specification ModalTL816measuring itemswind speed/ wind temperaturemeasuring ... ~55 nautical mile/h, 0~65land mile/hwind temperature-10~45º C, 14~113º Faccuracywind speedaccuracy:± 5%wind temperatureaccuracy: ± 2º Cresolution0 ...