I've been working in concrete for over 30 years and always had a linear spirit level with me. I have two rotary lasers, a visible light laser, almost one from Stabila, including a 4ft electronic laser and in certain situations I choose the line plane. They're unbeatable for speed in certain situations, and they're accurate enough for clearing puddles or just reading terrain quickly. They also allow for quick solo checks without having to tune the instrument. I wouldn't use it to actually level anything or determine an important slope. For short runs, regular bubble level is more accurate, and lasers are your best bet for consistent shapes. But for a few bucks I have one on my apron and in every truck.
Johnson Level & Tool 40-0912 Self-Leveling Cross-Line Laser Level, Red, 6 x 7 Inches
10 Review
π Kapro 905-41-24 24-Inch Level Tool - Premium Bubble Level with Shockproof End Caps, Superior Accuracy & Visibility, Optivision Red and Plumb Site Dual View Vial, Condor Spirit Level
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DigiPas DWL80PRO: Compact Digital Level & Angle Gauge - Accurate Protractor, Bevel Gauge, and Angle Finder, 0.05Β° Sensitivity, 4 inch Pocket Size
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π SKIL 24-Inch Digital Level - LV941901
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π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
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Triangle Group TR918 225/45 R18 95V summer
61 Review
π Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
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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