Purchased based on good reviews and price. However, I took a few measurements with it that made me suspicious, so I compared the results to a much more expensive model ($4,000+). While I didn't expect this level of perfection, the readings were typically 2-5 times higher than a more accurate and calibrated model. A house built in the mid 1980's was measured at over 0.9ppm (house has no new paint, carpet, kitchen, furniture etc.)! range from 0.07 to 0.17 for some measure of 0.12), but the large discrepancy this has with reality makes it unusable.
Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
23 Review
π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review
π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review
π Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
8 Review