... .2.[UNIT/MUTE]: at weighing mode, press it to change weighing unit. .At clock, thermometer mode, ... .3.[TARE/SET]: at weighing mode, press it to tare; At clock mode, press it to set time.4.[PCS/=]: ... at weighing mode, press it to counting ... at weighing mode, input price, then press it to set price; At calculator mode, it is a backspace. ...