The cheating among students shows a low value of honesty. A learning process in high school loaded with living values, namely honesty. This study aims to produce instruments to measure honesty in the learning process that is valid and reliable. The research used for research and development methods with 8 steps, namely (1) determining instrument specifications, (2) compiling, (3) choosing a measurement scale, (4) scoring, (5) examining, (6) limited experiment, (7) analyzing, and (8) concluding. The first trial involved 1167 parents of high school students in x class. A second trial involved 1261 parents of high school students on xi and xii class. Respondents lived in Wonosobo Regency, Indonesia. The research instruments included a questionnaire, observation, and interview instruction sheets. Data were analysed by expert judgment and explanatory factor analysis. Research produces valid and reliable instruments to measure honesty. A questionnaire with 4 items have Alpha's Cronbach coefficient 0.840. The observation consisted of 3 items with very good criteria. The interview guide has fulfilled the content validity after being corrected based on expert advice. The implication of the study is the students' honesty can be measure early so as not to develop into dishonest behaviour and lead to criminal acts.